Describe the three preflight mechanisms of regional heterothermy observed in bumblebees and large flying moths
What will be an ideal response?
Answer: First, a metabolic futile cycle involving two opposing enzymes results in ATP hydrolysis and heat production in the thorax. Second, two sets of antagonistic flight muscles can engage in a pattern of simultaneous contractions to generate heat without producing movement. And third, rapid wing movement generates heat, but by controlling the frequency and orientation of the wings, no lift is produced.
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An erection of the penis is caused by
A. muscle flexion of the penile muscles. B. blood filling the erectile bodies and compressing the veins. C. ejaculatory muscles. D. semen pressure from the testes and ductus deferens. E. increased secretions of lymph into the spongy tissue.
Which statement about platelets is incorrect?
a. They are produced in the bone marrow. b. They form the meshwork of a blood clot in which other cellular elements become entrapped. c. They form a plug when they adhere to the exposed collagen of a damaged vessel. d. When aggregated, they release thromboxane A2 that promotes secretion of ADP. e. When aggregated, they release ADP, which causes the surface of nearby circulating platelets to become sticky so that they also adhere to the enlarging platelet plug.
____________________ is an inflammation of the brain.?
Fill in the blank(s) with correct word
Identify the three layers of meninges.
a. Spinal mater b. Arachnoid mater c. Vertebral mater d. Pia mater e. Dura mater