cardiac muscle Flashcards
what are the threee chambers of a frog heart
one ventricle and two atria
What inotropic agents
chemicals that alter contractiliy of cardiac muscle
what is chronotropic agents
genes that increase or decrease heart rate
what drug affects the parasympathetic stimulation
acetylcholine
what drug can effect the heart stimulation
epinephrine
what drugs were applied to the heart
ACH, Atropine,Epinephrine,Digoxin and KCL
how do you find the refractory period
begining of the first contraction to the begining of the 2nd contraction
gents that alter heart rate are called______ , while agents that alter heart contractility (Contractile strength) are called_____
Chronotropic, Inotropic
Which of the following is not an experiment that is performed as part of the cardiac muscle lab?
Finding the length-tension relationship of cardiac Muscle
What inotropic effect does norepinephrine will have on cardiac myocytes and why?
Positive inotropy because it increases calcium in the sarcoplasm, increasing the strength of contraction.
Explain the terms Antagonists and Agonists.
Antagonist block the receptor sites and causes inhibition of the effect of neurotransmitters. Agonists enhance/mimic the action of neurotransmitters by binding to the receptors.
what is absolute refractory period
the interval of time during which a second action potential cannot be initiated, no matter how large a stimulus is repeatedly applied.
