Why do arteries lack the valves that are commonly present in veins?

A) No explanation is known.
B) The blood pressure in arteries is too high to permit valves to function correctly.
C) Arterial blood pressure is high enough that no valves are required to prevent the regurgitation of blood in the wrong direction.
D) The statement is untrue; arteries have valves.
E) None of the answers are correct.


C) Arterial blood pressure is high enough that no valves are required to prevent the regurgitation of blood in the wrong direction.

Anatomy & Physiology

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Normal development of the immune response is due in part to hormones produced by the ________.

A) adrenal medulla B) pancreas C) thyroid gland D) thymus gland

Anatomy & Physiology

____ are lipid Hormones that are converted from cholesterol

Fill in the blank(s) with correct word

Anatomy & Physiology

The process of preventing micturition in spite of initiation of the reflex involves

a. the cerebral cortex b. voluntary stimulation of the motor neuron supplying the external urethral sphincter c. voluntary stimulation of the internal urethral sphincter via its parasympathetic nerve supply d. both a and b e. a, b, and c

Anatomy & Physiology

Age-related changes to the pubic symphysis make the os coxae a reliable indicator of age at death for skeletal remains.

Answer the following statement true (T) or false (F)

Anatomy & Physiology