What two effects does sympathetic stimulation have on the heart during exercise?
Fill in the blank(s) with the appropriate word(s).
1. increases contractility
2. increases heart rate
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If gametes were diploid like somatic cells, how many chromosomes would the zygote contain?
A) Twice the diploid number, and with every succeeding generation, the chromosome number would continue to double and normal development could not occur. B) Half the diploid number with no change in development. C) Triple the diploid number, and with every succeeding generation, the chromosome number would continue to triple and normal development would not occur. D) There is no relationship between gametes and somatic cells.
Which of the following is not a reason for erythrocytes' flattened "doughnut" shape?
A) It allows them to fit together with leukocytes to facilitate the transport of both. B) It allows the minimum distance for diffusion of gases. C) It increases the surface area available for gas diffusion. D) It allows them to "stack" together to pass through small blood vessels more efficiently. E) It gives them flexibility so that they can pass through the circulation more easily.
Which organ of the female reproductive system is similar in structure to the penis?
A. Fimbraie B. Clitoris C. Areola D. Vestibule E. Hymen
Which of these results from the second meiotic division?
A. two diploid daughter cells with 46 chromosomes each B. two haploid daughter cells with 23 chromosomes each C. two diploid daughter cells with 23 chromosomes each D. a single daughter cell with 46 chromosomes, and a polar body with no genetic material E. two haploid daughter cells with 46 haploid chromosomes