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From superficial to deep, what is the correct order of structures that would be encountered if a needle was inserted into a testis?

A.

Tunica vaginalis, tunica albuginea, seminiferous tubules

B.

Tunica vaginalis, seminiferous tubules, tunica albuginea

C.

Tunica albuginea, tunica vaginalis, seminiferous tubules

D.

Seminiferous tubules, tunica vaginalis, tunica albuginea

Answer and Explanation

The Correct Answer is A

A. Tunica vaginalis, tunica albuginea, seminiferous tubules: The tunica vaginalis is the outer protective layer, followed by the tunica albuginea (a tough fibrous layer), and then the seminiferous tubules, where sperm production occurs.

B. Tunica vaginalis, seminiferous tubules, tunica albuginea: The seminiferous tubules are deeper than the tunica albuginea, making this order incorrect.

C. Tunica albuginea, tunica vaginalis, seminiferous tubules: This reverses the outer layers, as the tunica vaginalis is superficial to the tunica albuginea.

D. Seminiferous tubules, tunica vaginalis, tunica albuginea: This order is incorrect, as the tunica vaginalis and tunica albuginea are external to the seminiferous tubules.


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Related Questions

Correct Answer is C

Explanation

A. Blood pumped into a ventricle in one minute: This describes venous return but not cardiac output.

B. Blood pumped into the atria in one minute: Cardiac output measures blood leaving the heart, not entering the atria.

C. Blood pumped by each ventricle in one minute: Cardiac output is the amount of blood ejected by each ventricle in one minute. It is calculated by multiplying stroke volume (the amount of blood ejected per beat) by heart rate.

D. Blood pumped out of an atrium in one minute: This describes atrial function but is not related to the definition of cardiac output.

Correct Answer is A

Explanation

A. Enters the superior or inferior vena cava; exits the pulmonary arteries: Deoxygenated blood from the body enters the heart through the superior or inferior vena cava and flows into the right atrium. It then passes into the right ventricle and exits through the pulmonary arteries to the lungs for oxygenation.

B. Enters the aorta; exits the pulmonary veins: The aorta and pulmonary veins both handle oxygenated blood, not deoxygenated blood, making this incorrect.

C. Enters the superior or inferior vena cava; exits the coronary arteries: The coronary arteries supply the heart muscle itself with oxygenated blood, so this is incorrect for deoxygenated blood.

D. Enters the pulmonary veins; exits the aorta: Both the pulmonary veins and the aorta are part of the oxygenated blood circuit, making this incorrect for deoxygenated blood flow.

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