How many globins (protein building blocks) are found in a single hemoglobin molecule?
A. 1
B. 2
C. 4
D. 6
E. 8
C
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Tetanus of a muscle is thought to be caused by
A. the rapid movement of Na+ back into the sarcoplasmic reticulum. B. high Ca2+ concentrations in the sarcoplasm. C. decreased amounts of Ca2+ in muscle tissue. D. increased temperature in the active muscle. E. an increase in stimulus strength.
All of the following are common properties among skeletal, cardiac, and smooth muscle except;
A. they all exhibit the quality of excitability B. they all look the same because actin and myosin always have the same microscopic organization C. they all have the qualities of elasticity, extensibility, and contractibility D. they all being the process of contracting when actin is pulled by myosin
A ________ is a tender nodule formed around bursae over the base of the great toe
A) spur B) blister C) callus D) bunion E) pimple
In response to high blood pressure, stretch receptors called __________ in the walls of arteries carrying blood to the head will trigger a reflex that causes the heart to __________ its beats per minute.
A. baroreceptors; decrease B. proprioceptors; decrease C. baroreceptors; increase D. proprioceptors; increase E. chemoreceptors; increase