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What is the maximum volume of air that can be expelled from the lungs after maximum inspiration?

A.

Expiratory reserve volume

B.

Inspiratory capacity

C.

Vital capacity

D.

Tidal volume

Answer and Explanation

The Correct Answer is C

A. Expiratory reserve volume: Expiratory reserve volume is the additional air that can be forcefully exhaled after a normal exhalation, not the maximum after a maximal inhalation.
B. Inspiratory capacity: Inspiratory capacity is the maximum amount of air that can be inhaled after a normal exhalation (tidal volume + inspiratory reserve), not the total that can be expelled after maximum inspiration.
C. Vital capacity: Vital capacity is the maximum volume of air that can be expelled from the lungs after a maximum inspiration (inspiratory reserve + tidal + expiratory reserve) .
D. Tidal volume: Tidal volume is the volume of a normal, resting breath and is far less than the maximum expelled volume.


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Related Questions

Correct Answer is A

Explanation

A. Regulating body temperature of the testes:Correct -the scrotum suspends the testes and adjusts their position to keep testicular temperature slightly below core body temperature, which is necessary for optimal sperm production.
B. Storing urine:Incorrect -urine is stored in the urinary bladder, not in the scrotum.
C. Producing sperm: Incorrect -sperm are produced in the seminiferous tubules inside the testes; the scrotum is a protective/powerful thermoregulatory sac, not the sperm-producing tissue.
D. Carrying sperm to the urethra: Incorrect -ducts such as the vas (ductus) deferens carry sperm toward the urethra; the scrotum does not transport sperm.

Correct Answer is A

Explanation

A. Cervix:The narrow, tubular, inferior portion (“neck”) of the uterus that protrudes into the vagina; it contains the external os.

B. Perimetrium:The outer serosal covering of the uterus (visceral peritoneum); not a tube and doesn’t project into the vagina.

C. Vestibule:The external genital space between the labia minora with the urethral and vaginal openings; not part of the uterus.

D. External os:Merely the opening of the cervix into the vagina—not the entire projecting tubular structure.

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