Actin myofilaments
A. are held in place by the M line.
B. contain strands of fibrous actin.
C. resemble bundles of minute golf clubs.
D. contain both myosin and tropomyosin.
E. are the thickest proteins in muscle.
Answer: B
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Which of the following connections is not true relating the urinary system and other body system?
A) The urinary system works with the lymphatic and cardiovascular systems to regulate fluid levels in the body. B) The urinary system works with the nervous system to control the micturition reflex. C) The skeletal system, specifically the sacrum and coccyx, help protect the bladder. D) The endocrine, specifically the hypothalamus producing renin, acts on the kidneys to produce more urine. E) The muscular system, specifically the cremaster muscle and sphincters, helps with voiding the bladder.
The influence of blood vessel diameter on peripheral resistance is ________.
A) the only factor that influences resistance B) significant because resistance is inversely proportional to the fourth power of the vessel radius C) significant because resistance is directly proportional to the blood vessel diameter D) insignificant because vessel diameter does not vary
The synovial tendon sheaths that surround tendons as they pass over bones are a type of tubular ________.
Fill in the blank(s) with the appropriate word(s).
Muscles that guard entrances and exits of internal passageways are ________ muscles
A) parallel B) convergent C) pennate D) bipennate E) circular