,1. Multiple Choice: Which of the following structures is
responsible for the exchange of gases in the lungs?
A) Alveoli
B) Bronchi
C) Trachea
D) Diaphragm
Correct Answer: A) Alveoli
Rationale: Alveoli are the tiny air sacs in the lungs where
the exchange of oxygen and carbon dioxide occurs, which
is essential for respiration.
2. Fill-in-the-Blank: The _______ valve prevents backflow of
blood from the aorta into the left ventricle.
Correct Answer: Aortic
Rationale: The aortic valve is crucial for maintaining
unidirectional blood flow during the cardiac cycle.
3. True/False: The kidneys are part of the lower respiratory
tract.
Correct Answer: False
Rationale: The kidneys are organs of the urinary system,
not the respiratory system.
, Rationale: The skeletal system protects vital organs,
stores minerals like calcium, and produces blood cells in the
bone marrow. It does not conduct sound waves; that is a
function of the auditory system.
5. Multiple Choice: The primary function of the small
intestine is:
A) Absorption of nutrients
B) Production of digestive enzymes
C) Filtration of waste products
D) Synthesis of vitamins
Correct Answer: A) Absorption of nutrients
Rationale: The small intestine's main role is to absorb
nutrients from digested food into the bloodstream.
6. Fill-in-the-Blank: The basic functional unit of the nervous
system is the _______.
Correct Answer: Neuron
Rationale: Neurons are the cells that transmit nerve
impulses, which are fundamental for nervous system
functions.
7. True/False: Cardiac muscle cells are capable of
spontaneous contraction.
Correct Answer: True
Rationale: Cardiac muscle cells can contract without
neural stimulation due to the presence of pacemaker cells
that regulate the heartbeat.
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