54. Metamorphosis is (A) changing of one body form to another within a species, such as the change from an aquatic tadpole to a terrestrial frog. (B) an intermediate condition, such as length of legs in mice between longer legs of some mice and shorter legs in others, a condition caused by Hox genes. (C) the developmental changing of a scale to a feather. (D) the evolutionary transition from fishes to amphibians.

55. Which of the following would NOT be an example of negative feedback control in homeostasis? (A) Blood volume and pressure drop due to minor bleeding. This decreased pressure causes the kidneys to increase water reabsorption to restore blood volume and pressure. (B) Exposure to cold water causes body temperature to drop. Decreased stimulation of heat receptors causes constriction of blood vessels near the skin and better retention of heat. (C) Glucose levels rise following consumption of a big dessert, triggering release of insulin which causes glucose levels to fall. (D) During the birth process, stretch receptors in the uterus stimulate the release of oxytocin from the pituitary gland. This hormone stimulates uterine muscle contraction that increases stimulation of the stretch receptors.

相關試題

相關試卷