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Physiology
-StudyStack Set 2: Week 7-13
| Question | Answer |
|---|---|
| The action potential seems to “leap” from node to node along a myelinated fiber. This type of impulse regeneration is called __________ conduction. | saltatory |
| The magnitude of the action potential peaks when the sodium channels close. | True |
| The magnitude of the action potential peaks when the sodium channels close. | Gated-channel receptor |
| Excitatory neurotransmitters are most likely to: | initiate an action potential. |
| A slight shift away from the resting membrane potentials in a specific region of the plasma membrane is called a _____ potential. | local |
| Severe depression can be caused by a deficit in certain brain synapses of: | amines |
| Severe depression can be caused by a deficit in certain brain synapses of: | vagus |
| Which of the following is not an example of sympathetic stimulation? | Constriction of the bronchioles |
| Nerves that innervate the floor of the pelvic cavity and some of the surrounding areas are found in the _____ plexus. | coccygeal |
| Most effectors of the autonomic nervous system are dually innervated by sympathetic and parasympathetic neurons. | True |
| Which of the following is not a function of the hypothalamus? | Regulation of motor activity |
| Impulses sent over which of the following tracts could result in voluntary movement, especially of the hands, fingers, feet, and toes of the opposite side? | Lateral corticospinal |
| Conduction by the sixth cranial nerve results in sensations of hearing. | False |
| Norepinephrine is liberated at: | most sympathetic postganglionic nerve endings. |
| The type of cells that secrete ACTH are: | corticotrophs. |
| The receptors responsible for sensing crude and persistent touch are the: | Ruffini corpuscles. |
| The two-point discrimination test can be used to measure: | the sensitivity of the skin in various parts of the body. |
| When a small amount of one hormone allows a second hormone to have its full effect, the phenomenon is called: | permissiveness. |
| Dynamic equilibrium depends on the functioning of the | crista ampullaris. |
| Neutrophils are highly mobile and phagocytic. They migrate out of blood vessels and into tissue spaces. This process is called | diapedesis. |
| Which are the two baroreceptors that are located near the heart? | aortic baroreceptors and carotid baroreceptors |
| A glycoprotein hormone that is secreted to increase oxygen concentration in the tissues is | erythropoietin. |
| During pregnancy, what happens to the oxygenated blood returned from the placenta via the umbilical vein? | It flows into the inferior vena cava. |
| The body’s defense mechanisms can be organized into one of two major categories of immune mechanisms; these are | innate and adaptive immunity. |
| _______ is the only antibody class with the ability to cross the placental barrier, providing passive immunity to the developing fetus during pregnancy. | IgG. |
| The functions of the lymph nodes are | defense and hematopoiesis. |
| During their residence in the thymus, pre-T cells develop into _____, cells that proliferate as rapidly as any in the body. | thymocytes |
| What is the function of the spleen? | All of the above: tissue repair, hematopoiesis, red blood cell and platelet destruction, blood reservoir |
| Recognition of antigens by antibodies occurs when an | antigen’s epitopes fit into and bind to an antigen molecule’s antigen-binding site. |
| External respiration can be defined as: | the exchange of gases between the lung and the blood capillaries in the lung AND pulmonary ventilation. |
| Ciliated cells lining the respiratory tract: | help move the mucus blanket toward the pharynx. |
| Which of the following is not a regulated process associated with the functioning of the respiratory system? | Control of cell metabolism rate |
| The PCO2 in the atmosphere is: | less than in the alveolar air. |
| Dalton law states that the partial pressure of a gas in a mixture of gases is _____ to the total pressure of the mixture. | directly related to the concentration of that gas in the mixture and |
| Which of the following combinations in arterial blood could cause an increase in the respiratory rate? | Increased PCO2, decreased arterial pressure, decreased pH, decreased PO2 |
| If the tidal volume of a given individual is 500 ml, then the anatomical dead space is approximately _____ ml. | 150 |
| The hormone that stimulates the gallbladder to release bile is: | cholecystokinin. |
| The hormone thought to be a messenger causing release of digestive enzymes from the intestinal mucosa is: | cholecystokinin-pancreozymin. |
| The major site for the absorption of the end products of digestion is the: | small intestine. |
| Which of the following is not one of the openings that must be blocked when food moves from the pharynx into the esophagus? | Oropharynx |
| The final product of carbohydrate digestion is a: | monosaccharide. |
| The sodium cotransport or coupled transport acts to transport sodium ions and glucose molecules _____ the GI lumen. | passively out of |
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robyneliz4
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