The human genome consists of approximately 3.2 billion base pairs. Protein-coding genes represent ________ of the total genome.
A) 25
B) 10
C) 2
D) 50
E) 99
C) 2
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What are the major components of the axial skeleton?
A) arms, legs, hands, and feet B) the skull, vertebral column, and pelvis C) the skull, vertebral column, and thoracic cage D) the shoulder and pelvis
As a result of a sudden increase in the blood pressure, the baroreceptors signal a(n) ___ in sympathetic outflow, which results in a(n) ___ in peripheral resistance and return of blood pressure to normal.
a. increase, decrease b. decrease, increase c. increase, increase d. decrease, decrease
Fontanels are ________ in an infant
A) fibrous connective tissues lining the cranial cavity B) fibrous connective tissues lining paranasal sinuses C) spaces between the unfused cranial bones D) cartilages covering cranial bones E) fibrous connective tissues lining the orbits
Which statement about the effects of aging on the endocrine system is false?
A. Estrogen and testosterone decrease dramatically with aging. B. The increase of estrogen and testosterone cause osteoporosis. C. Some hormone levels remain high but target tissue may lose their sensitivity. D. Levels of hormones decline with age.