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

1. Neuroendocrine glands, such as the adrenal medulla, consist of nervous tissue yet secrete chemicals known as neurohormones.

2. In the second-messenger system, the first messenger initiates a cellular change in activity by binding a receptor in the plasma membrane.

3. Endocrine cells that release hormones in response to the concentration of a certain ion or molecule in the blood or extracellular fluids are stimulated by humoral stimuli.


1. TRUE
2. TRUE
3. TRUE

Anatomy & Physiology

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Severe diarrhea can diminish potassium ion absorption

Indicate whether the statement is true or false

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Chemoreceptors called __________ bodies are found in the neck and monitor pH, CO2, and O2 levels.

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

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Parasympathetic preganglionic neurons synapse with postganglionic neurons in the adrenal medulla.

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

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Digestive juices in the lumen of the intestine move across which surface of the epithelial cells there?

A. Intracellular surface B. Basal surface C. Laminar surface D. Apical surface

Anatomy & Physiology