Second Test Bio 161

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AceMommy7
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103242
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Second Test Bio 161
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2011-09-24 02:31:23
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LA DH Harper
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Slides for second test in Bio 161 Harper
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  1. What is graded potential?
    A weak change in membrane potential which can die out.
  2. A weak stimulus ( below threshold level) causes only a few WHAT to open?
    SODIUM
  3. An action potenial is NOT?
    Reached
  4. Synapse
    Where a "blank" "Blank" is passed from one neuron to another?
    Action Potential
  5. SYNAPSE
    What kind of messenger is involved when crossing a synaptic cleft?
    A chemical messanger
  6. There are two kinds of Synapes what are they?
    • 1. Excitatory
    • 2. Inhibitory
  7. What brings post-synaptic cell to action potential?
    Exitatory Synapes
  8. What prevents post-synaptic cell from reaching action potential?
    Inhibitory synapes
  9. What happens when you have more complex movements?
    More synapes are working
  10. Do you need the brain to involve a reflex?
    NO you do not!
  11. What is synaptic delay?
    • The time it takes from:
    • Action potential reaching the axon terminal end of the presynaptic cell UNTIL action potential begins in postsynaptic cell.
    • SO-the MORE synapse in a nerve pathway the LONGER it takes an impulse to reach its destination.
  12. What is it called when (one cell is influenced by many other) during IMPUT?When there are many cells to one Neuron?
    CONVERGENCE
  13. What is it called when during OUTPUT ( one cell influences many others)? not is influenced BY many others but is influencing many others?
    DIVERGENCE
  14. What does graded potential at a synapse mean?
    If a few presynaptic cells release neurotransmitter ( in a convergence) were it is influenced by many cells, it may not be enough to trigger an action potential in the postsynaptic cell.
  15. What is SUMMATION in a nerve pathway?
    • Temporal Summation:
    • Stronger stimulus= more frequent action potetials.
    • Weaker stimulus=less frequent action potentials.
    • Temp.....Tempo how fast and how long....
    • Think of the beeping during class demenstraion
  16. FREQUENCY=
    SUMMATION
  17. Spatial summation: is what?
    • Stronger stimulus= freater number os neurons reach action potential.
    • Weaker stimulus= less neurons reach action potential.....
  18. Spatial summation=
    NUMBER
  19. HORMONES:
    What are they and what do they do? A list of five different things?
    • 1) chemical messsangers made up of Proteins and Lipids.
    • 2)released by endocrine glad into the bloodstream.
    • 3)carried throughout the bady in the blood.
    • 4)Act on other TARGET cells within other organ systems ( or other Endocrine glands) changing the activity of those cells.
    • 5) they are controlled through Negative feed-back regulation.
  20. What are Hormones (Chemical messangers) made up of?
    Protein & Lipids
  21. Where are the hormones released into and where do they come from?
    • 1) Released into the bloodstream
    • 2) by the Endocrine glands
  22. How are hormones carried thorughout the body?
    In the blood
  23. Where are the hormones released into and where do they come from?
    They are released into the blood and come from the Endocrine glands
  24. What kind of cells do they act upon?
    TARGET CELLS
  25. Hormones are controlled through what kind of feedback?
    Negative or Positive?
    NEGATIVE feed-back
  26. The nervous system is what?
    4 things
    • 1) major regulatory system
    • 2)Rapid electrical signals ("WIRED")- like a phone line! Class discussion.
    • 3)SHORT distant chemical messangers ( Neurotransmitters)
    • 4) Resonse is repid, but short in duration.
  27. What two systems are major regulatory systems?
    The NERVOUS & ENDOCRINE systems
  28. What system is ("WIRELESS")?
    ENDOCRINE system
  29. The endocrine system is invoved in what kind of messangers?
    LONG distant CHEMICAL messangers.
  30. The ENDOCRINE system has what kind of response & what kind of duration?
    Slower response and longer duration.
  31. The brain requires a steady supply of what two things?
    • Oxygen and glucose
    • The brain uses glucose for energy.
  32. Can the brain store glucose for later use?
    NO
  33. How much of our total body weight is our brain when we are born?
    10%
  34. Movements on the right side of our bodies are controlled by which side of the brain?
    The Left
  35. Nerve pathways carrying instructions from the cetral nervous to the muscles are called?
    MOTOR NEURONS
  36. Nerve pathways carrying information to the central nervouse are called?
    SENSORY NEURONS
  37. SENSORY neurons are Efferent or Afferent?
    Afferent
  38. MOTOR neurons are Efferent or Afferent?
    Efferent
  39. Afferent=
    Carries infomation to the (CNS)
  40. Effernet=
    (CNS) to effernet, muscles or glands carry out orders and bring out the disired effect.
  41. What is SOMATIC?
    Fibers that innervate motor neurons that supply the skeletal muscles.
  42. AUTOMATIC=
    Fibers that innervate smooth muscle, cardiac muscle and glands
  43. SYMPATHETIC=
    FIGHT or FLIGHT
  44. PARASYMPATHETIC=
    Innervates most of the organs supplied by the automatic system. (CALM) REST & DIGEST.
  45. Everyday life it is a balance between both parasympathetic and sympathetic.....
  46. What are the ways the brain is protected?
    • 1) enclosed by CRANIUM, vertable cortex that surronds the spinal cord.
    • 2)There are protective layers three of them Meninges between bony covering and the nervouse tissue.
    • 3)Brian floats in Cerebrospinal fluid.
    • 4)(BBB) Protects from materials into the brain and has a tight junction.
  47. Photoreceptors are?
    Responsible for visual wavelengths of light.
  48. Mechanoreceptors=
    sensitive to micanical energy
  49. Thermoceptors are?
    sensitive to heat and cold
  50. Osmoreceptors are?
    detects changes in the concentration of solute in the (ECF) and sresulting in changes in osmotic activity.
  51. Chemoreceptors=
    sensitive to certain chemicals
  52. Nocireceptors or pain receptors are?
    are sensitve to tissue damage such as cutting or burning.
  53. The brain and spinal cord are part of what?
    The Central Nervous System
  54. What does the Central Nervous System process and integrate?
    information coming from and going to the peripheral nervous system
  55. The Peripheral Nevous System consists of what two pathways?
    Afferent & Efferent
  56. What carries information from receptors to the central nervous system?
    The Afferent pathways
  57. What patway carries information from the central nervous system to tissues and organs?
    The Efferent pathways
  58. An Afferent pathway is what kind of stimuli?
    Sensory and Visceral stimuli
  59. The Efferent pathway controls what two nervous systems?
    The SOMATIC and AUTONOMIC nervous systems
  60. The SOMATIC controls what neurons?
    MOTOR NEURONS
  61. The Autonomic nervous system controls what three systems?
    • 1) Sympathetic
    • 2) Parasympathetic
    • 3) also the ENTERIC nervouse system....which is part of the stimuli in the digestive tract
  62. The MOTOR neurons control what muscles?
    Skeletal muscles
  63. The sympathetic and parpasympathetic systems control what ?
    Smooth muscle, cardiac muscle,exocrine gland, and some endocrine glands.
  64. The ENTERIC nercouse system controls what?
    Digestive organs ONLY
  65. The Effector organs are made up of what?
    Muscle and gland tissue.....
  66. When your biceps feel a stimulis what does it do?
    CONTRACTS is EXCITATORY
  67. When the TRICEPS feel stiulis what does it do?
    RELAXES and INHIBITORY
  68. The central nervouse system consists of what?
    The brain and the spinal cord
  69. What does Plasticity of the brain mean?
    When you learn new connections between neurons are made, NOT NEW NERVE CELLS
  70. What is it called when you are a little baby and you are learning how to grab things and learn new small movements?
    Your brain has PLASTICITY
  71. Maintaining Homeostasis in the brain:
    How do we do that?
    • The homeostasis conditions are monitored more closly than those of the rest of the body.
    • The (BBB) helps to keep the enviorment in the brain in a steady state.
  72. What three things does the (BLOOD Brain Barrier) help protect the brain against?
    • 1) Fluctuations in the electrolytes
    • 2) circulating hormones from reaching the brain
    • 3) Harmful BBB from reaching the brain
  73. Is there a constant supply of blood to the brain?
    YES AT ALL TIMES....
  74. Flow of blood and blood pressure to the brain does not fluctuate!
  75. What does the brain need a constant supply of?
    OXYGEN,GLUCOSE
  76. What is needed to supply the ATP in the brains blood?
    Oxygen, and Glucose
  77. What does the Cerebral cortex control?
    • Sensory
    • movment
    • language
    • personality
    • memory
    • decisions
    • creativity
    • consciousness
  78. What does the Basal Nuclei control?
    • Muscle tone
    • Movements
  79. What does the Thalamus control?
    • Synaptic imput
    • Sensation
    • Consciouness
    • Motor control
  80. What does the Hypothalamus control?
    • Temperature
    • Thirst
    • Urine
    • Food intake
    • Link between nervous and Endocrine system
    • Emotion & behavior
  81. What does the Cerebellum control?
    • Balance
    • Muscle tone
    • Coordination
  82. What does the Brain Stem (midbrain, pons and medulla) control?
    • Crainial nerves
    • Cardiovascular,respiratory,digestive
    • Reflexes
    • Equilibrium
    • Synaptic imput from spinal cord
    • Arousal
    • Sleep-wake cycle
  83. Afferent pathways are?
    Sensory imput
  84. Homeostaaic conditions usually never reach a conscious awarness level in what pathway?
    Afferent or Efferent?
    Afferent
  85. Conscious sensations are?
    Somatic and Specialized
  86. What are the sensations for somatic sensations?
    Touch,pressure,heat,cold,pain
  87. What are the sensations for specialized senses?
    Vision,hearing,taste
  88. A specialized ending os a neuron or a seperate cell that is closely associated with a neuron?
    what kind of receptor is it?
    Sensory receptors
  89. Stimulus ( Heat, sound,light,pressure) must be converted to electrical energy ( action potenial) what is the name of this?
    TRANSDUCTION
  90. Stimualation------) receptor membrane permeability-------)na+influx-------)graded potential (if stimulus is weak)------) action potential (if stimulus reaches threshold.........
  91. If a stimulus is weak what is it?
    A graded potential
  92. If a stimulus is reaching threshold (strong) what is it?
    Action Potential
  93. Photoreceptor?
    Light
  94. Mechanoreceptor?
    Includes stretch receptors in the skeletal muscle, receptors in the ear
  95. Baroreceptors?
    Monitor blood pressure
  96. Thermoreceptors?
    Heat or cold
  97. Chemoreceptors?
    detect chemicals like co2 & o2 smell, taste
  98. Osmoreceptors?
    Change in solute concentration...(osmosis)
  99. Norciceptor?
    PAIN
  100. Sensory Adaptation:
    receptor adapts to sustained stimulus by not responding to it to the same degree.
  101. Phasic receptors are they Important or Unimportant?
    They are Unimportant adapt reapidly to sustained stimulus.
  102. Tonic receptors are they important or unimportant?
    Important.... DO NOT ADAPT or it they do VERY slowly... important to any change in PH.
  103. Sensory Acuity: The area around a sensory receptor= receptive feild.......
  104. What is Sensory Acuity mean?
    The area around a sensory receptor= receptive feild
  105. When the receptors are more DENSE what is the receprtive field? & What is the ACUITY?
    Smaller receptive feild and Higher the Acuity
  106. In the peripheral nervous system the EFFERENT pathways are what two things?
    Autonmic and Somatic
  107. Autonomic goes out to what part of the body?
    The organs and glands
  108. The somatic goes out to what part of the body?
    The skeletal muscle
  109. The autonommic nervouse system does what?
    Innervates CARDIAC and SMOOTH musle, most exocrine glands and some endocrine glands.
  110. Neurotransmitters at effector organs?
    • Parasympathetic: ACETYLCHOLINE
    • Sympathetic: NOREPINEPHRINE
  111. Parasympathetic is what?
    Sleepy, resting
  112. Sympathetic is what?
    Higher activity level... Fight or Flight
  113. What are the two neurons in the autonomic nerve pathway?
    preganglionic fiber and postganglionic fiber
  114. The hypothalamus and adrenal glands are border line being nervous system or endorcrine system.
  115. Epinepherine is found mostly where?
    In the blood
  116. The adrenal medulla is a modified part of?
    sympathetic nervouse system
  117. The adrenal medulla produces what?
    Norepinephrine 20% and epinephrine 80%
  118. The adrenal medulla releases the norepinephrine and epinephrine into?
    The blood as hormones instead of as messengers to postganglionic fiber.
  119. The adrenal medulla reinforces the effect of the?
    sympathetic nerve pathways
  120. The receptors of the effecot organs canstimualte activity on some organs and inhibit in others? True or false?
    This is true.....
  121. The response of the effector organ depends on the type of receptor on the tissue cells? True or false?
    This is true
  122. What are the two types of Autonomic receptors?
    Cholingergic receptors and Andrenergic receptors
  123. Cholinergic binds to ACh? True or false?
    True
  124. Nicotinic receptors - found on postganglionic cell bodies of all autonomic gaglia
    Muscarinic receptors- found on effector cell mambranes.
    Are part of what receptors?
    autonomic receptors....
  125. Alpha (a) receptors
    &
    Beta (b) receptors are part of what receptors?
    Andrenergic receptors...They bind to norepinephrine and epinephrine....

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