Each of the following is true of the pineal gland except that it
A) is a component of the epithalamus.
B) is a component of the hypothalamus.
C) secretes melatonin.
D) contains pinealocytes.
E) responds to light and darkness.
Answer: B
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What is the purpose of motor nerve varicosities as they relate to smooth muscle?
A. They link the thin filaments to the inside of the sarcolemma in smooth muscle. B. They reabsorb the decomposition products of acetylcholine after acetylcholinesterase breaks it down. C. They enable each cardiac myocyte to directly stimulate its neighbors. D. They release neurotransmitter onto smooth muscle cells. E. They prevent single-unit smooth muscle cells from pulling apart.
The inner cell mass
A. becomes part of the placental membrane. B. gives rise to the embryo. C. becomes part of the chorion. D. forms the amnion.
Why is the genetic code described as a triplet code?
A) It is described as a triplet code because 3 ATP molecules are required to produce each protein. B) It is described as a triplet code because a sequence of three nitrogenous bases specifies the identity of a specific amino acid. C) It is described as a triplet code because a minimum of three amino acids are required to produce a functional protein. D) It is described as a triplet code because three RNA molecules participate in the transcription of the DNA. E) It is described as a triplet code because there are three nucleotides in DNA.
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.