,1. Multiple Choice: Which hormone is primarily responsible for
the regulation of plasma calcium concentration?
a) Calcitonin
b) Parathyroid hormone
c) Thyroxine
d) Insulin
Answer: b) Parathyroid hormone
Rationale: Parathyroid hormone increases plasma calcium levels
by stimulating osteoclasts to release calcium from bones, increasing
intestinal calcium absorption, and decreasing renal calcium
excretion.
2. Fill-in-the-Blank: The _________ valve prevents backflow of
blood into the left atrium.
Answer: Mitral
Rationale: The mitral valve, also known as the bicuspid valve, is
located between the left atrium and left ventricle and prevents the
backflow of blood during ventricular contraction.
3. True/False: The action potential in a neuron is an all-or-none
response.
Answer: True
, Rationale: An action potential is an all-or-none event; once the
threshold is reached, the neuron fires and the action potential
travels down the axon without decreasing in strength.
4. Multiple Response: Select all that apply. Which of the following
are functions of the liver?
a) Production of bile
b) Synthesis of plasma proteins
c) Storage of glycogen
d) Regulation of blood glucose levels
e) Production of red blood cells
Answers: a), b), c), d)
Rationale: The liver has multiple functions including bile
production, synthesis of plasma proteins, storage of glycogen, and
regulation of blood glucose levels. It does not produce red blood
cells; this occurs in the bone marrow.
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