Calcium ions serve as messengers, often in combination with the intracellular protein

A) calcitonin.
B) calcitriol.
C) calmodulin.
D) calcium-binding globulin.
E) calcitropin.


Answer: C

Anatomy & Physiology

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Which of the following is NOT true of tonus?

A. It is a state of slight muscle contraction. B. During periods of tonus, the motor units take turns contracting. C. It occurs when a muscle is fully contracted. D. It keeps the motor units healthy and ready to contract at any time. E. All of these are true of tonus.

Anatomy & Physiology

The term aerobic means

a. in the blood. b. with carbon dioxide. c. with oxygen. d. without carbon dioxide. e. without oxygen.

Anatomy & Physiology

In addition to temperature control, blood flowing to the skin supplies a source of ____________________

Fill in the blank(s) with correct word

Anatomy & Physiology

Prostaglandins are ________.

A. long-range hormones B. formed slowly C. limited in function D. produced by many body tissues

Anatomy & Physiology