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Lec 3 phys exam
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The property of muscle tissue that allows it to return to its original shape after stretching or contracting is called:
Elasticity
The property of muscle tissue that describes its ability to receive and respond to stimuli is:
Excitability
The function of Ca+ in skeleton muscle contractions is to do what:
Bind to tropin on the thin myofilaments so that myosin binding on actin can be exposed
What structures meat the NMJ:
Axon and sarcolemma
The function of myoglobin is to
Bind O2 for aerobic respiration
The purpose of the phosphogen system is to
Store the high energy
The sustained partial contraction of a portion of a skeletal muscle is called:
Tonus
A motor unit is:
A motor neuron plus all skeletal muscle fibers it stimulates
The synaptic vesicles seen in an axon terminal at a NMJ contain
Acetylcholine
Sarcomeres are separated from each other by the
Z disc
The term power stroke when used relative to skeletal muscle contraction refers to the
Swiveling of the myosin heads as they combine with actin
The function of acetylcholine esterase
Breakdown of acetylcholine
What is happening during the latent period of a muscle contraction?
Open calcium channels in the sarcoplasmic recticulum that Ca+ can diffuse in sarcoplasma
A sustained muscle contraction that lacks even partial relaxation between stimuli is referred to as
Incomplete tetanus
Thin filaments contain
Actin, troponin, and tritomyosin but not myosin
The all or nothing principle of skeletal muscle contraction states that
All of the muscle cells of an individual motor unit will contract to fullest extent or not at all
During depolarization phase of an action potential, which of the following situations exist?
The inside membrane becoming more positive with respect to outside
During repolarization phase action potential which situation exists?
The inside of membrane become more negative with respect to outside
When the ions are moving across the membrane during the depolarization and repolarization phases of an action potential they are moving by:
Simple diffusion
Which of the following events occur first in an action potential:
Depolarization
The term saltatory conduction refers to the:
Conduction of a nerve impulse along a myelinated axon
Neurotransmitters control the passage of ions through
Chemically gated channels
The absolute refractory period for a neuron is the time
During which a second action potential cannot be initiated no matter how strong the stimulus
Local anesthetics such as procaine and lidocaine block pain sensations by
Preventing opening of voltage gated N+ channels
Action potentials occur only when
Voltage gated ion channels open
Which of the following lists, is the components of reflex arc in correct order of functioning?
Receptor, sensory neuron, integrating center, motor neuron, effector
The contralateral reflex that helps you maintain balance when the flexor reflex is initiated is
Crossed (leg) extensor reflex
Tapping the knee during physical exam tests for the patellar reflex
Stretch reflex
An epislateral monosynaptic reflex that is important in maintaining muscle tone and muscle coordination during exercise is
Stretched reflex
Which of the following occurs when trying to focus on a close object?
Contraction of the ciliary muscle to make the lens more convex
The first step in visual transduction is
Absorption of light by photo pigment in rods and cones
When your mother told you to eat your carrots she was giving you good advice because carrots contain carotinoids necessary for the formation of
Photo pigment s of the retina
When stapes moves back and forth it directly causes what
The oval window to move in and out
Which of the following events of hearing occurs first?
The tympanic membrane vibrates
A scratch on the cornea most directly interferes with
Refraction
Causes of respiratory alkalosis?
A and B (hyperventilation and aspirin overdose)
The 2 hormones that regulate reabsorption in the final portion of the DCT and collecting ducts are
Aldosterone and antidiuretic hormone (ADH)
The permeability of the collecting ducts to H2O is regulated by
Antidiuretic hormone (ADH)
In the proximal convoluted tubule symporters that use the Na+ concentration difference are responsible for reabsorption of
Both glucose and amino acids
Filtration of blood in the glomerular is promoted by
Blood hydrostatic pressure
All of the following are normally found in urine except
Glucose
The forces that oppose filtration of substances from the glomerular capillaries into the glomerular (Bowmans space)
B and D (blood colloid osmotic pressure and capsular hydrostatic pressure)
Levels of Na+ in the blood are regulated by
Aldosterone also ADH and ANP
Which of the following would serve to buffer H+
HCO3- (bicarbonate)
Hypokalemia is what
Low plasma level of K+
Which of the following is not an important rule for Ca+ in the body?
Buffer for metabolic acid
An ion that acts as a cofactor to Na+/K+ adipose is
Magnesium
The sweet odor of diabetic urine is due to the presence of
Ketone bodies
An ion channel that opens and responds to direct changes in the membrane potential ______channel.
Voltage-gated
A membrane whose polarization is more than the resting level is said to be ________.
Hyperpolarized
Rapid opening of voltage-gated sodium ion channels brings about _______
Depolarization
Recovery of the resting potential due to opening o voltage gated ion channels and closing of voltage-gated ion channels _______
Repolarization
The synaptic of function contact between two neurons or between neuron effectors_______
Synapse
Binding of light rays as they pass through a different media is called______
Refraction
The increase in the curvature of the lens of near vision is called______
Accommodation
With aging the lens looses elasticity and therefore its ability to change shape this condition is_______
Prespyopia
The medial movement of the eyeball so that both are directed toward the object is called______
Convergence
The photo pigment in the rods is ______
Rhodopsin
Sound intensity is measured in units called______
Decibels
When daily urine output is less than 50ml per day the condition is known as ______
Anuria
The movement of the material from the tubular fluid is called______
Tubular reabsorption
The amount of filtrate forms in the amino capsule in both the kidney and _______
Glomerular filtration rate
GBHP – (CHP + BCOP), when GBHP = glomembular blood hydrostatic pressure. CHP = Capsular HSP + BCOP = blood colloid osmotic pressure is the
Net filtration pressure
The primary method by which water moves between fluid compartments is______
Osmosis
One kidney test screening ________ measures the level of nitrogen in the urine as part of urea.
Blood urea nitrogen
The homeostatic range Ph for extra cellular fluid is ______
7.35 - 7.45
A admits and refracts lights B refract light C provides blood supply, absorbs scattered light D regulates amount of light that enters the eye
A cornea
D iris
B lens
C choroid
Two genes that code for the same trait and are in the same location on homologous chromosomes are reffered to as alleles
True
False
True
The genetic make up of the organism is called the genotype
True
False
True
The traits that are expressed are called the phenotype
True
False
True
Females have 2 chromosomes designated as X
True
False
True
Males have X and Y chromosomes
True
False
True
Author
Noein13
ID
149448
Card Set
Lec 3 phys exam
Description
Lec 3 phys exam
Updated
4/23/2012, 2:52:43 AM
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