The sites where a chemical substance is transmitted from the presynaptic terminal of an axon to the postsynaptic membrane of a muscle fiber are called
A. cell bodies of neurons.
B. Z disks.
C. myofilaments.
D. sarcomeres.
E. neuromuscular junctions.
Answer: E
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When the level of ADH (antidiuretic hormone) decreases,
A) a concentrated urine is produced. B) less urine is produced. C) the osmolarity of the urine decreases. D) permeability to water in the collecting system increases. E) water reabsorption increases in the nephron loop.
Carla was startled by an extremely loud bang that sounded like a gunshot. Her heartbeat accelerated rapidly. When she found that the noise was only a car backfiring, she felt greatly relieved but her heart kept beating heavily for over half an hour. Why did this happen?
What will be an ideal response?
The process of cells specializing during development is
A) embryology. B) implantation. C) differentiation. D) meiosis. E) None of the answers are correct.
Explain why a pseudostratified epithelium is not truly stratified
A) All the cells do not contain a nucleus. B) All the cells are not columnar. C) All the cells form a single layer and contact the basement membrane. D) All the cells' nuclei are round instead of elongated. E) All the cells are not linked by tight junctions.