In the absence of pulmonary surfactant, smaller alveoli display a larger inward-directed pressure than do larger alveoli
Indicate whether the statement is true or false
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When the bladder wall is distended as a result of urine accumulation, the stretch receptors are stimulated and send afferent impulses to the spinal cord that
a. stimulate parasympathetic nerves, which return to the bladder and cause it to contract. b. inhibit the motor neurons that normally keep the external urethral sphincter closed. c. stimulate nerves that go to the kidney and prevent glomerular filtration until the bladder is empty. d. both (a) and (b) above. e. all of these answers.
Which of the following are composed of actin?
A) thick filaments B) thin filaments C) all myofilaments D) None of the listed responses is correct.
Olfactory hairs are ________; taste hairs are ________.
A. actin filaments; myosin filaments B. microvilli; microvilli C. cilia; cilia D. cilia; microvilli E. microvilli; cilia
Jorge is donating bone marrow to a friend of his who has leukemia (a type of blood cell cancer). Jorge is 30 years old, so the doctor knows she must insert the needle in
a. the diaphysis of the femur. b. the hip bone. c. the distal epiphysis of the tibia. d. the diaphysis of the humerus.