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Cardiovascular - Pharmacology
Pharmacology
14
Physiology
Undergraduate 1
11/12/2012

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Cards

Term
what does "intrinsic" mean?
Definition
"within the heart"
Term
what does "extrinsic" mean?
Definition
"from outside the heart"
Term
What is "Cardiac Automaticity"?
Definition
Heart is able to initiate its own rhythmic contractions w/o requiring a stimulation from outisde the heart.
Term
What is "Cardiac Automaticity" caused by?
Definition
Cardiac Automaticity is caused by "leaky" cell membranes, in which calcium & sodium ions slowly leak into the cells. this leaking causes a slow depolarization to threshold, thus firing an action potential & initiating contractions of cardiac muscle.
Term
The cells that are most "leaky" to oins & that depolarize fastest constrol the rate of contraction of all other cardiac cells; thus, they act as pacemakers for the rest of the heart. What is the pacemaker of the heart called?
Definition
Sinoatrial Node
Term
What is the Sinoatrial node?
Definition
A group of specialized cells near the junction of the vena cava and the right atrium. (The Sinoatrial node is present in mammalian hearts, in comparison to frogs, for example.)
Term
What is "Systole"?
Definition
Contraction period of the heart
Term
What is "Diastole"?
Definition
Relaxation period of the heart
Term
What is the "contraction period" of the rhythmic cycle that atria & ventricles are synchronized to?
Definition
Systole
Term
What is the "relaxation period" of the rhythmic cycle that atria & ventricles are synchronized to?
Definition
Diastole
Term
What is the "Sinoatrial node" equivalent in the frog's heart during lab?
Definition
"Sinus Venosus" is equivalent to the Sinoatrial node found in mammalian hearts
Term
Can the heart still beat with the Central Nervous system destroyed?
Definition
Yes, it is controlled by intrinsic mechanisms
Term
what is "positive chronotropic"?
Definition
Rate increasing (heart)
Term
what is "positive inotropic"?
Definition
strength increasing (heart)
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