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Physiology
week 7-13
| Question | Answer |
|---|---|
| Which membrane receptor acts to directly change ion permeability when stimulated? | Gated-channel receptor |
| In a myelinated neuron, the impulse can travel under the myelin between nodes of Ranvier. | False |
| The fastest nerve fibers in the body can conduct an impulse that is how much faster than the slowest fibers in the body? | Almost 300 times faster |
| The fastest nerve fibers in the body can conduct impulses up to approximately _____ meters per second. | 130 |
| If the center of a reflex arc is the brain, the response it mediates is called a | cranial reflex. |
| Nerve impulses over the _____ nerve cause increased peristalsis and decreased heart rate. | vagus |
| The production of thyroid hormone is stimulated by another hormone from the: | anterior pituitary. |
| The major hormone produced by the corpus luteum is: | progesterone. |
| If you slammed your finger in a car door, it would stimulate _____ pain fibers. | acute |
| The physiological mechanism that dissolves clots is known as | fibrinolysis. |
| _____ is used to determine the volume percentage of red blood cells in whole blood. | Hematocrit |
| The vagus is said to act as a “brake” on the heart. This situation is called | vagal inhibition. |
| The chemoreceptors in the carotid bodies are particularly sensitive to: | hypercapnia. |
| Which are the two baroreceptors that are located near the heart? | aortic baroreceptors and carotid baroreceptors |
| Which of the following is a powerful poison that acts directly on any cell and quickly kills it? | lymphotoxin |
| The functions of the lymph nodes are | defense and hematopoiesis. |
| ____ refers to a phenomenon in which the genetic characteristics common to a particular kind of organism provide defense against certain pathogens. | Species resistance |
| When carbon dioxide dissolves in water, some of the carbon dioxide molecules associate with water to form | carbonic acid. |
| _____ law states that the volume of a gas is inversely proportional to its pressure. | Boyle’s |
| According to the law of partial pressures, the partial pressure of gas in a mixture of gases is | directly related to the concentration of that gas in the mixture and to the total pressure of the mixture. |
| Which structural feature facilitates oxygen diffusion from the alveolar air into the blood in lung capillaries? | All of these are correct. |
| Pressure gradients are established by changes in the | thoracic cavity. |
| Stimulation of gastric juice secretion occurs in all of the following phases except the _____ phase. cephalic | digestive |
| The ejection of bile from the gallbladder is controlled by which hormones? | CCK and secretin |
| Peristalsis is regulated in part by the intrinsic stretch reflexes. It is also thought to be stimulated by the hormone | cholecystokinin (CCK) |
| Chemical digestion requires the secretion of _____ into the lumen of the GI tract. | digestive enzymes and bile |
| The hormone thought to be a messenger causing release of digestive enzymes from the intestinal mucosa is: | vasoactive intestinal peptide. |
| The hormone that inhibits gastric muscle, slowing passage of food into the duodenum, is called: | gastric inhibitory peptide. |
Created by:
Jleonard12