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Jennifer Walos
Weeks 7-13
| Question | Answer |
|---|---|
| Movement of the membrane potential away from zero (below the usual RMP) is called | hyperpolarization. |
| Which membrane receptor acts to directly change ion permeability when stimulated? | Gated-channel receptor |
| When a neuron is resting, the inner surface of its plasma membrane is slightly positive compared with its outer surface. | False |
| What mechanism quickly terminates the action of a neurotransmitter once it binds to its postsynaptic receptor? | Neurotransmitter molecules are transported back into synaptic knobs, Neurotransmitter molecules are transported into nearby glial cells, Neurotransmitter molecules are metabolized into inactive compounds. |
| Neurons are the only living cells that maintain a difference in the concentration of ions across their membranes. | False |
| In a myelinated neuron, the impulse can travel under the myelin between nodes of Ranvier. | True |
| 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 |
| Which of the following is not used by the body as a neurotransmitter? | Nitric oxide Acetylcholine Carbon monoxide |
| Within the nervous system, coding for the strength of a stimulus is accomplished through: | the frequency of nerve impulses. |
| The only ion(s) that can diffuse across a neuron’s membrane when the neuron is at rest is (are): | potassium |
| For a neurotransmitter to produce an inhibitory postsynaptic potential, which of the following channels must open? | Potassium and/or chloride channels |
| A _____ is a skeletal muscle or group of muscles that receives motor axons from a given spinal nerve. | myotome |
| “Fight or flight” physiological changes include all of the following EXCEPT | constriction of respiratory airways. |
| Afferent nerves or fibers are found only in the _____ nervous system. | sensory and autonomic |
| The parasympathetic and sympathetic divisions always act with a cooperative influence, and through summation of the impulses, the effect can be increased. | False |
| All of the following are examples of parasympathetic stimulation except: | increased heart rate. |
| A small molecule binds to a G protein, preventing its activation. What direct effect will this have on signaling that involves cAMP? | Adenylyl cyclase will not be activated |
| Which hormone is released by the pituitary to stimulate the thyroid gland? | thyrotropin |
| Which of the following statements is not true of the pineal gland? | Melatonin is stimulated by the presence of sunlight. |
| Movement of hair cells in the organ of Corti against the _____ membrane can stimulate nerve impulse condition. | tectorial |
| If you slammed your finger in a car door, it would stimulate _____ pain fibers. | acute |
| Which is not true of the hormone somatostatin? | It stimulates the secretion of insulin. |
| Fluid shift is when | the body's fluids move between the fluid compartments. |
| The second step of hemostasis occurs when additional coagulation factors beyond factor VII respond in a cascade to form fibrin strands. Fibrin stands strengthen what? | platelet plug |
| The foramen ovale allows blood to move from the right atrium to the left atrium | bypassing pulmonary circulation. |
| Which two factors promote the return of venous blood to the heart? | blood-pumping action of respiration and skeletal muscle contractions |
| A decrease in the amount of white blood cells is called | leukopenia |
| Fluid that is clear, watery and contains protein molecules, salts, and other substances is called | intercellular fluid |
| Antigen presenting macrophage interact with | a T-helper cell that recognizes the same antigen |
| Each cortical nodule is composed of packed lymphocytes that surround a less dense area called a | germinal center. |
| The compound formed when carbon dioxide combines with hemoglobin is | carbaminohemoglobin. |
| When carbon dioxide dissolves in water, some of the carbon dioxide molecules associate with water to form | carbonic acid. |
| During the respiratory cycle, intrapleural pressure is always less than alveolar pressure. This difference is called | transpulmonary pressure. |
| 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 |
| 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. |
| What percentage of this blood flow comes from the hepatic portal system? | 80% |
| The chemical process in which a compound unites with water and then splits into simpler compounds is called | hydrolysis |
| Hydrolysis refers to: | using water to split larger compounds into smaller ones. |
| Which of these is not an example of mechanical digestion? | Moistening the food |
| Which blood vessel carries absorbed food from the GI tract to the liver? | Portal vein |
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JenWalos
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