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BIOD102 / BIOD 102 Module 3:
( Update 2025 / 2026) Essential Biology II with Lab Questions & Answers - Portage Learning
Question:
What causes the "lub-dub" sound of the heart?
Answer:
Result of the four valves opening and closing.
Lub-blood slapping into the closed AV valves Dub-slamming shut of the large semilunar valves
Question:
Describe the differences between the effects of acetylcholine on cardiac cells and the neuromuscular junction.
Answer:
ACh in cardiac cells has an inhibitory effect whereas in the neuromuscular junction it has an excitatory effect. 1 / 3
Question:
In what vessels is blood pressure the lowest?
Answer:
Venules
Question:
What is the result of the fainting mechanism?
Answer:
Effectively, your head reaches the same level as your heart as you collapse to the ground in a lying position, and this small change in position quickly increases blood flow to your delicate brain tissue.
Question:
True or False; If false, explain why the statement is false: Vasodilation involves contraction of smooth muscle
Answer:
Vasoconstriction involves contraction of smooth muscle.
OR Vasodilation involves relaxation of smooth muscle
- / 3
Question:
Which type of muscle is found within blood vessels and organs?
Answer:
Smooth
Question:
True or False; If false, explain why the statement is false: Systole is the
relaxation phase of the cardiac cycle.
Answer:
False; Systole is the contraction phase of the cardiac cycle.
OR Diastole is the relaxation phase of the cardiac cycle
Question:
Which type of neurons receive information from an organism's external and internal environment and transmit the information to the brain?
Answer:
Sensory neurons
- / 3
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