HUMAN PHYSIOLOGY TEST 3
Card Set Information
HUMAN PHYSIOLOGY TEST 3
Get ready for the smackdown!
What is the equation for Blood Flow?
Blood Flow=Change In Pressure/Resistance (around 90)
Factors that determine resistance to blood flow?
Blood Vessel Diameter
Viscosity of Blood
Blood Vessel Length
What is Poiseulles Law?
What is a pace maker potential?
Spontaneous Depolarization due to SA node.
During a pacemaker potential what gates open and close?
K Channels close
Funny Channels open
What are the two types of Calcium channels, and when are they utilized?
I & F type. Utilized in Rapid Depolarization.
Descripe AP process in a contractile cell
Increase Permeability to NA
Decrease Permeability to Na (Depol)
Increase Permeability to Calcium (Plateau)
Repolarization via open Potassium Channels.
Resting membrane potential is -90
Starts via Na & Ca passing through GAP JUNCTIONS!
What are gap junctions?
Connective channels between cardiac muscle.
What is the P Wave?
What is the QRS complex?
What is the T Wave?
What is the PQ segment?
Time between initiation of atrial depol n venticular depol
What is the Q-T segment?
Time between Ventricular depolarization and ventricular repolarization. (Ventricular contraction and systole)
What is the R-R segment?
What is Tachycardia?
Increased Heart Rate
What is Bradycardia
decreased heart rate
Describe the degrees of heart block
1.Increase in P-Q segment. (Delay between SA to AV)
2. Greater increase. Loss of 1:1 P to QRS
3. Loss of AV conduction. P & QRS are independent.
What is systole?
What is diastole?
What is the pericardium?
Membranous Sac around heart. Decreases friction
What are the layers of the heart wall?
Endo, Myo, Epicardium
Properties of cardiac muscle
Cells are smaller than cells of skeletal muscle.
Cells demonstrate branching
Striations are EVIDENT!
No cell division after infancy
99% contractile cells
Path of conduction in heart
SA node- AV node- AV Bundle (Bundle of His) - Bundle Branches- Purkinje fibers
What is the fastest AP firing cells in the heart?
SA Node (Pacemaker) Sets rate of rest for the rest.
What is Stoke Volume?
What is the equation for Cardiac Output?
CO= SV x HR
What is the equation for mean arterial pressure?
MAP=CO x TPR
What are some short term regulations of MAP?
Heart & Neural Contral (Sympathetic & Parasympathetic)
Nerve Regulation of MAP
Baroreceptors- detect arteriol stretch
Cardiovascular Center --> Medulla Oblongata --Receives baroreceptor signals
What would a drop in MAP cause from a regulation stand point?
Increase in cardiovascular activity via sympathetic n parasympathetic activity.
Two types of capilleries?
Coninuous & Fenestrated
Bypass from arteries to veins.
How do proteins exchange in capillaries?
What is the equation for net filtration pressure?
NFP=(Capillary Hydrostatic-Interstitial Hydrostatic) - (Capillary Osmotic- Intersitilal Osmotic)
What does starlings law say?
Heart automatically adjusts to acommadate blood volume.