Biol 320 Exam 2 Newest 2025/2026 Actual Exam Complete Questions And Correct Answers(Verified Answers) |Already Graded A+

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Biol 320 Exam 2 Newest 2025/2026 Actual Exam

Complete Questions And Correct Answers(Verified

Answers) |Already Graded A+

What are the types of arteries and veins, from aorta to

vena cava? - ANSWER-elastic arteries, muscular arteries,

arterioles, capillaries, venues, small veins, large veins




Which layer of blood vessels contain muscle? - ANSWER-

tunica media




What system controls the tunica media? - ANSWER-

sympathetic nervous system

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What is the tunica intima made of? - ANSWER-

endothelium




What is the tunica externa made of? - ANSWER-collagen

fibers




What does an elastic artery do? - ANSWER-takes out the

bounding pulse




What is the rate of the SA node? - ANSWER-70-75 bpm




What is the delay of the AV node and why? - ANSWER-

1/10 a second allows for both atria to contract

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What is the neurotransmitter for the sympathetic ANS? -

ANSWER-norepinephrine




What is the neurotransmitter for the parasympathetic

ANS? - ANSWER-acetylcholine




What is the Bainbridge reflex? (atrial reflex) - ANSWER-

Heart rate increases when blood volume increases




How does thyroxin affect heart rate? - ANSWER-longer,

slower HR