Which of the following provides an accurate example of negative feedback regulation?
A. High blood glucose inhibits secretion of glucagon.
B. Low insulin levels inhibit insulin receptor formation.
C. Low blood glucose stimulates secretion of insulin.
D. Low blood glucose inhibits secretion of glucagon.
Answer: A
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Why doesn't semen enter the urinary bladder during ejaculation?
A) The smooth muscle sphincter at the base of the urinary bladder closes. B) There is no urge to urinate during sexual intercourse because of the suppression of LH by testosterone buildup in the blood. C) Ejaculation is a parasympathetic reflex resulting in no response by urinary contraction muscles. D) There is no common duct between the reproductive system and the urinary system.
If blood pressure doubled at the same time that the peripheral resistance doubled, the blood flow through a vessel would be
A) unchanged. B) 16 times greater. C) doubled. D) 1/16 as much. E) halved.
A newborn infant is found dead, abandoned by the road. Among the many questions that the police would like to have answers to is whether the infant was born dead or alive. After an autopsy, the medical examiner tells them that the infant was dead at birth. How could the medical examiner determine this?
What will be an ideal response?
The ________ gland is an extrinsic salivary gland, whereas the ________ gland is an intrinsic salivary gland.
A. lingual; labial B. lingual; sublingual C. sublingual; parotid D. submandibular; sublingual E. submandibular; lingual