Which of the following can cause anemia? I) bone marrow disease II) iron deficiency III) low number of white blood cells
A) I
B) II
C) III
D) I and II
D
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When a neuron is at rest, _____
a. it is at threshold potential b. gated sodium channels are open c. it holds less sodium than the interstitial fluid d. both it is at threshold potential and it holds less sodium than the interstitial fluid
Endothermic animals
a. use up more energy than ectotherms. b. are more active at a wider range of temperatures than ectotherms. c. have a higher metabolic rate than ectotherms. d. may have feathers to reduce heat loss. e. fit all of these descriptions
Which of these eye structures is responsible for allowing a person to see color?
A) sclera B) cones C) incus D) rods
Blood pressure is carefully regulated by a negative feedback control system in the body. When the blood pressure falls below a set point, this decreased pressure is detected by baroreceptors (pressure receptors) in the aorta and carotid arteries
These receptors send signals to a region of the brain known as the medulla oblongata. This region of the brain integrates incoming signals and sends signals to the heart to increase the strength of contractions and to the blood vessels, to constrict arterioles so as to increase the blood pressure, returning it to normal. Based on this information, identify each of the parts of this control system: a) controlled variable b) sensor c) control center d) effector(s)