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Which of the following consists of a midpiece, head, and flagella?

Ovum

Fallopian tubes

Zygote

Sperm

Answer and Explanation

The Correct Answer is D

A. Ovum: The ovum is the female gamete, which is round and lacks a midpiece, head, or flagella.

B. Fallopian tubes: These are female reproductive structures, not cells.

C. Zygote: A zygote is the cell formed after fertilization, without a midpiece or flagella.

D. Sperm: A sperm cell has a head (with genetic material), midpiece (with mitochondria), and flagellum (tail for movement).

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Correct Answer is D

Explanation

A. Is stimulated by darkness: Melatonin is stimulated by darkness; GH may have a circadian rhythm but is not specifically triggered by darkness.

B. Is stimulated by low levels of calcium: Low calcium levels stimulate parathyroid hormone (PTH), not GH.

C. Is secreted by the kidneys: GH is secreted by the anterior pituitary, not the kidneys.

D. Stimulates growth: GH promotes growth of bones, muscles, and tissues.

A. Secretes in response to elevated glucose levels B. Secretes in response to decreasing calcium blood levels C. Secreted by the parathyroid gland D. Secreted by the thyroid gland

Correct Answer is D

Explanation

A. Secreted in response to elevated glucose levels: T3 and T4 regulate metabolism, not glucose.
B. Secreted in response to decreasing calcium blood levels: This describes PTH, not T3/T4.
C. Secreted by the parathyroid gland: T3 and T4 are secreted by the thyroid gland.
D. Secreted by the thyroid gland: T3 (triiodothyronine) and T4 (thyroxine) are thyroid hormones involved in metabolic regulation.

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Which of the following consists of a midpiece, head, and flagella?

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Naxlex Comprehensive Predictor Exams

Growth hormone:

Correct Answer is D

Explanation

T3 and T4 are:

Correct Answer is D

Explanation

Which of the following best describes why it is necessary that the testes descend into the scrotum?

Enlargement of the prostate may impede urination because

Aldosterone:

Insulin and glucagon:

The adrenal gland secretes which hormone that has a role in the sympathetic response of nervous system?

Oxytocin:

In what structure does sperm maturation take place?

Implantation of the embryo occurs within which organ?