The almost identical cells produced by cleavage divisions are called
A) centromeres.
B) blastomeres.
C) telomeres.
D) myosomes.
E) somal cells.
B
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Contraction of the circular smooth muscle in the gastrointestinal tract wall decreases the diameter of the lumen, while contraction of the longitudinal smooth muscle shortens the tract.
Answer the following statement true (T) or false (F)
Which of the following describes phospholipids in the plasmalemma?
A) The phosphate heads are hydrophobic. B) The lipid tails are hydrophobic. C) The heads are on the inside. D) The tails are at the surface. E) The lipid tails are hydrophilic.
The structures that form the respiratory membrane include:
(1) elastic fibers (2) secondary bronchioles (3) the basement membrane of the alveolar epithelium (4) the pulmonary nerve plexus (5) capillary walls A) All of the answers are correct. B) None of the answers are correct. C) 2, 4 D) 3, 5 E) 2, 4, 5
Functions of the respiratory system include
A) protecting respiratory surfaces from dehydration and temperature changes. B) producing leukocytes needed to defend against invading pathogens. C) generating neurotransmitters essential to the neural control of respiration. D) providing erythrocytes, especially during times of increased oxygen demand. E) melanin synthesis and utilization to shield alveoli from environmental hazards.