Which of the following develops 4 to 5 days postfertilization?

a. The morula
b. Early cleavage (4-cell stage)
c. The blastocyst
d. The zygote


Answer: c. The blastocyst

Anatomy & Physiology

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The major body parts derived from mesoderm are the

A) respiratory tract, urinary bladder, and urethra. B) epidermis, hair, nails, and glands of skin. C) muscle tissue, bone tissue, and bone marrow. D) nervous system and sense organs.

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What structure anchors the spinal cord to the coccyx and is considered part of the pia mater of the spinal cord?

A) Conus medullaris B) Denticulate ligament C) Filum terminale D) Dural sheath

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Any agent that interferes with water absorption or that causes water secretion into the gastrointestinal tract can cause diarrhea

Indicate whether the statement is true or false.

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Thirteen year-old Austin exhibits retarded growth, reduced metabolism, lack of normal reproductive gland development, inability to regulate water intake or water elimination from the body, and an uncontrolled appetite

What part of Austin's brain is most likely involved? A. reticular formation B. primary sensory cortex C. medulla oblongata D. thalamus E. hypothalamus

Anatomy & Physiology