What is the primary effect of a decrease in the hematocrit of elderly individuals?
a. reduction in the maximum cardiac output
b. damage to ventricular cardiac muscle fibers
c. lowering of the oxygen-carrying capacity of the blood
d. thrombus formation in the blood vessels
Ans: c. lowering of the oxygen-carrying capacity of the blood
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________ is a hormone that has only one known effect: to stimulate milk production by the breasts.
Fill in the blank(s) with the appropriate word(s).
The normal pacemaker of the heart is the
a. SA node b. AV node c. bundle of His d. Purkinje system e. ventricular myocardium
A myofibril is the
A. structural and functional unit of the skeletal muscle fiber. B. cytoplasm of a muscle fiber. C. plasma membrane of a muscle fiber. D. protein strand composed of actin. E. contractile thread that extends the length of the muscle fiber.
Which of the following is not found in the axial region of the body?
A. Cervical region B. Abdominal region C. Thoracic region D. Carpal region