Nerve cells generate electrical signals in response to changes in the environment. This is an example of ________.

A. movement
B. digestion
C. respiration
D. responsiveness
E. filtration


Answer: D

Anatomy & Physiology

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What hormone promotes an increase in the activity of osteoclasts?

A) estrogen B) calcitonin C) testosterone D) parathyroid hormone (PTH)

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The pulmonary trunk receives blood from the right ventricle and conducts it toward the lung.  The pulmonary trunk is a(n)

A. capillary. B. artery. C. vein.

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Most nonelectrolytes are covalently bonded organic molecules

Indicate whether this statement is true or false.

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Proteins called ________ are channel proteins that allow the passage of metabolites between neighboring cells.

Fill in the blank(s) with the appropriate word(s).

Anatomy & Physiology