Which of the following characteristics would be most beneficial for animals to successfully survive on land?
A) The presence of a notochord and dorsal nerve cord.
B) The ability to undergo metamorphosis.
C) The presence of an open circulatory system.
D) The presence of an exoskeleton.
Answer: D
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How would the absolute refractory period be affected if voltage-regulated sodium channels failed to inactivate?
A) It would last indefinitely. B) It would be much briefer. C) It would be basically unaffected.
Matching
A) Cystic fibrosis B) Achondroplasia C) Albinism D) Tay-Sachs disease E) Huntington's disease 5) Lack of skin pigmentation. 6) Rare type of dwarfism resulting from an impaired ability of the fetus to lengthen long bones by endochondrial ossification. 7) An unremitting, fatal nervous system disease involving degeneration of the basal nuclei. 8) A condition of drier excessively sticky mucus production. 9) A disorder of brain lipid metabolism.
Which of the following is true regarding endocrine glands?
A. They secrete their products by way of ducts. B. Their secretions may be released onto the body surface. C. They have an unusually low density of blood capillaries. D. They secrete substances that do not alter the metabolism of their target cells, but have extracellular effects. E. They release their secretions into the blood.
________ sweat glands are widely distributed across the body surface, ________ glands are located wherever hair follicles exist, and ________ sweat glands are found only in a few areas
A) Sebaceous; merocrine; apocrine
B) Apocrine; merocrine; sebaceous
C) Merocrine; sebaceous; apocrine
D) Merocrine; apocrine; sebaceous
E) Apocrine; sebaceous; merocrine