An individual with the condition of myasthenia gravis is faced with an autoimmune disorder in which the body defenses attack acetylcholine receptors on muscle cells
What would be the expected effect on calcium levels near contractile proteins, following the arrival of an electrical impulse at those neuromuscular junctions? A) a rapid decrease in concentration due to uptake by sarcoplasmic reticulum
B) a rapid increase in concentration due to release by sarcoplasmic reticulum
C) small or no increases in concentration due to weak responses by acetylcholine receptors
D) a large decrease in concentration that occurs slowly
E) a large increase in concentration that occurs slowly
C
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The primary muscle(s) involved in human breathing is/are called the
a. external intercostals. b. internal intercostals. c. diaphragm. d. abdominal wall muscles. e. lung muscles.
A Barr body
A. is an inactive Y chromosome that produces reduced amount of gene products. B. exists within the cell in the form of heterochromatin. C. exists within the cell in the form of euchromatin. D. is an inactive X chromosome that does not produce gene products. E. Two of the above answers are correct.
The cells that line the inside of the blastopore become the
A) nervous system. B) muscles. C) skin. D) skeleton. E) digestive tract.
Mammals are thought to have evolved from
A. dinosaurs. B. marsupials. C. archosaurs. D. therapsids. E. thecodonts.