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Beatrice Smith

Physiology Weeks 7-13

QuestionAnswer
In depolarization the membrane potential moves toward zero, whereas in hyperpolarization the membrane potential moves away from zero. True
If the threshold potential is surpassed, the full peak of the action potential is always reached. True
What is the difference between a somatic reflex and an autonomic reflex? A somatic reflex is caused by contraction of skeletal muscles, whereas an autonomic reflex consists of contraction of smooth or cardiac muscle or secretions of glands.
All of the following cranial nerves are involved in proprioception except the: vagus. - ANSWER hypoglossal. accessory. abducens.
The _____ consists of several structures that lie beneath the thalamus and form the floor of the third ventricle and the lower part of its lateral walls. hypothalamus
The set of coordinated commands that control the programmed muscle activity mediated by extrapyramidal pathways is called the motor program.
Both sympathetic and parasympathetic divisions are tonically active, which means they continually conduct impulses to autonomic effectors.
Which of the following is true about pain receptors? Alpha fibers are associated with sharp, localized pain.
Dynamic equilibrium depends on the functioning of the crista ampullaris.
The type of cells that secrete ACTH are: corticotrophs.
The clear and potassium-rich fluid that fills the labyrinth is endolymph.
All of the following are granulocytes except neutrophils. eosinophils. lymphocytes. ANSWER basophils.
In the extrinsic pathway of stage 1 of the clotting mechanism, chemicals released from damaged tissues trigger the cascade of events that ultimately result in the formation of prothrombin activator.
Adaptive immunity, part of the body’s third line of defense, is orchestrated by two different classes of a type of white blood cell called the lymphocyte.
Recognition of antigens by antibodies occurs when an antigen’s epitopes fit into and bind to an antigen molecule’s antigen-binding site.
The presentation of an antigen by an antigen-presenting cell activates the T cell. The cell then divides repeatedly to form a clone of identical sensitized T cells that form effector T cells and memory cells.
The mechanism that produces pulmonary ventilation is one that establishes a gas pressure gradient between the atmosphere and the alveolar air.
The basic rhythm of the respiratory cycle of inspiration and expiration seems to be generated by the medullary rhythmicity area.
The forced expiratory volume test can determine the presence of respiratory obstruction by measuring the volume of air expired per second during forced expiration.
Peristalsis is regulated in part by the intrinsic stretch reflexes. It is also thought to be stimulated by the hormone cholecystokinin (CCK)
Stimulation of gastric juice secretion occurs in all of the following phases except the _____ phase. digestive
CCK is an intestinal hormone that causes the pancreas to increase secretion of exocrine high in enzymatic content. opposes the influence of gastrin on gastric parietal cells. stimulates contraction of the gallbladder so that bile can pass into the duodenum. * all of the above
Created by: smithbea
 



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