The atrioventricular valves (tricuspid and bicuspid) open when the papillary muscles:

A) contract
B) relax


Answer: B) relax

Anatomy & Physiology

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A neuron has received a signal, causing ion channels to open in the cell membrane, letting positively charged ions flow in. This has caused the membrane potential to change suddenly from –70 to +50 millivolts. This will cause a (an) _____ to occur.

a) resting state b) action potential c) negative charge d) positive charge

Anatomy & Physiology

Contrast the functions of the following pairs: thalamus and hypothalamus; cerebellum and basal nuclei

What will be an ideal response?

Anatomy & Physiology

A long bone is covered externally with a sheath called the ________, whereas the marrow cavity is lined with the ________.

A. epiphysis; diaphysis B. compact bone; spongy bone C. diaphysis; epiphysis D. endosteum; periosteum E. periosteum; endosteum

Anatomy & Physiology

Which of the following adult structures is not derived from the same primary germ layer as the others?

A. Muscles B. Bones C. Blood vessels D. Nerves

Anatomy & Physiology