Which statement defines total lung capacity?
It is the air in the lungs after maximal inhalation.
It is the quantity of air that a person can move into or out of the lungs.
It is the amount of air that remains in the lungs after a normal tidal expiration.
It is the maximum volume of air that can be exhaled from the lungs after maximum inhalation.
The Correct Answer is A
A. It is the air in the lungs after maximal inhalation: Total lung capacity (TLC) refers to the total amount of air the lungs can hold after maximum inhalation.
B. It is the quantity of air that a person can move into or out of the lungs: This defines vital capacity, not total lung capacity.
C. It is the amount of air that remains in the lungs after a normal tidal expiration: This describes functional residual capacity, not TLC.
D. It is the maximum volume of air that can be exhaled from the lungs after maximum inhalation: This is the definition of vital capacity (VC), not total lung capacity.
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Related Questions
Correct Answer is D
Explanation
A. Lipids and proteins: While bile is involved in fat digestion, it does not emulsify proteins.
B. Proteins: Bile does not emulsify proteins. Proteins are broken down by enzymes like pepsin.
C. Carbohydrates and proteins: Bile has no role in the digestion of carbohydrates or proteins.
D. Lipids: Bile emulsifies lipids, breaking them into smaller droplets to facilitate enzymatic digestion by lipases.
Correct Answer is C
Explanation
A. To ensure that the uterus is securely connected to the supporting ligaments: This is not the primary function of the middle layer (myometrium); rather, the supporting ligaments provide stability to the uterus.
B. To allow the uterus to shed tissue during menstruation: This is primarily the function of the endometrium, the inner layer of the uterine wall.
C. To allow the uterus to contract during childbirth to expel the fetus: The middle layer, known as the myometrium, is composed of smooth muscle that contracts during labor to help expel the fetus.
D. To provide the uterus with adequate space to grow a fetus: While the uterine structure allows for fetal growth, the myometrium’s primary role is in contractions rather than providing space.
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