affees cardiac action potentials in the SA Nodal cells, atrial cells, and ventri
ID: 3479132 • Letter: A
Question
affees cardiac action potentials in the SA Nodal cells, atrial cells, and ventricolar cells. (Hint: Think of the molecular mechanisms that regulate cardiae cels 17. Explain how the sympathetic and parasympathetic nervous system 18. List and describe the passive mechanisms used to exchange materials across the capillary wall. 19. Which of the following substances would be expected to directly increase arteriolar resistance to blood flow? (There can be more than one) a. Angiotensin I b. Adenosine c. Norepinephrine d. Bradykinin e. Histamine 20. Explain why you chose your answer in question #19.Explanation / Answer
Answer 17) (Mandatory)
Parasympathetic receptors: The parasympathetic postganglionic fibers are cholinergic. Acetylcholine can bind to two types of cholinergic receptors called nicotinic receptors and muscarinic receptors
Acetylcholine is the predominant neurotransmitter from the parasympathetic nervous system, in both the preganglionic and postganglionic neurons
Effect of parasympathetic on heart:
Decreases heart rate
Sympathetic receptors: There are two types of adrenergic receptors: and . In the cardiovascular system there are 1, 2, 1, and 2adrenergic receptors
Sympathetic neurotransmitter :
Preganglionic = acetylcholine
Postganglionic =norepinephrine (NE)
Sympathetic action on heart :
Increase heart rate
Increase muscle contraction of heart
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