Central organ of the lymphatic system is:

(a) tonsils
(b) thymus
(c) spleen
(d) lymph nodes


Ans: (b) thymus

Anatomy & Physiology

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The basic structural unit of compact bone is the __________.

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

Anatomy & Physiology

Which respiratory drug category decreases the viscosity of respiratory secretions?

a. expectorant b. mucolytic c. antitussive d. decongestant

Anatomy & Physiology

Which of the following best explains the drop in blood pressure that occurs when one goes from lying down to standing up?

A. An increase in afterload causes a drop in stroke volume, cardiac output, and blood pressure. B. Venous compliance allows blood to pool in the legs, decreasing venous return. This causes a drop in cardiac output and blood pressure. C. An increase in preload causes a drop in stroke volume, cardiac output, and blood pressure. D. The heart rate decreases. This is due to the baroreceptor reflex reducing sympathetic output to the SA node.

Anatomy & Physiology

Voltage-gated Na+ ion channels are sensitive to changes in the extracellular concentration of

A) Ca2+ ions. B) Cl- ions. C) K+ ions. D) proteins.

Anatomy & Physiology