What is systole?
A) Pressure in the veins
B) Contraction phase of the heart
C) Pressure in the arteries
D) Relaxation phase of the heart
Answer: B
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The type of muscle fibers that have only a single nucleus, both thick and thin filaments, but no Z discs, are
A. cardiac. B. smooth. C. skeletal. D. cardiac and skeletal. E. cardiac and smooth.
_______________ acidosis results from the abnormal retention of carbon dioxide
Fill in the blank(s) with correct word
The embryonic genital tubercle develops into the ____ in males and the ____ in females
a. scrotum; labia majora b. glans penis; clitoris c. penis; labia minora d. Wolffian ducts; Müllerian ducts e. penis; vagina
All of the following are effects of aging on the respiratory system except which one?
A. Obstructive sleep apnea may develop in the elderly as the pharyngeal muscles intermittently relax and block the airway during sleep. B. With age, less mucus accumulates in the respiratory tract because the ciliated escalator becomes more efficient. C. Thoracic wall compliance decreases due to the diminished ability to expand the chest. D. Some of the alveoli walls may breakdown, which reduces the area of the respiratory membrane.