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sci221 part 2
| Question | Answer |
|---|---|
| stimulus-gated channels open in response to | sensory stimuli |
| the active transport mechanism in the plasma membrane that transports sodium and potassium ions in opposite directions and at different rates is the | sodium potassium pump |
| a synapse consists of | synaptic knob, synaptic cleft, plasma membrane of the postsynaptic neuron, |
| a slight shift away from the resting membrane potentials in a specific region of the plasma membrane is called a __ potential | local |
| T/F Blood vessels in both digestive organs and skeletal muscles are dilated by sympathetic stimulation | false |
| norepinephrine is liberated at | most sympathetic postganglionic nerve endings |
| nerves that innervate the floor of the pelvic cavity and some of the surrounding areas are found in the __ plexus. | coccygeal |
| the vomiting reflex is mediated by the | medulla |
| all of the following at nonsteriod hormones: | oxytocin, calcitonin, glucagon |
| visceroceptors are located in which of the following | internal organs |
| the chemoreceptors in the carotid bodies are particularly sensitive to: | hypercapnia |
| during pregnancy, what happens to the oxygenated blood return from the placenta via the umbilical vein? | it flows into the interior vena cava |
| the difference between systolic pressure and diastolic pressure is called | pulse pressure |
| the heart begins beating in the fetus at about what stage of development | after about 4 weeks |
| complement can best be described as a(n) | enzyme in blood |
| recognition of antigens by antibodies occurs when an: | antigen's epitopes fit into and bind to an antigen molecule's antigen-binding site |
| which of the following is a powerful poison that acts directly on any cell and quickly kills it? | lymphotoxin |
| the function of surfactant is to | prevent each alveolus from collapsing as air moves in and out during respiration |
| the PCO2 in alveolar air is ___ blood. | less than in the systemic venous, and equal to the systemic arterial |
| ciliated cells lining the respiratory tract: | help move the mucus blanket toward the pharynx |
| which blood vessel carries absorbed food from the GI tract to the liver? | portal vein |
| which of the folliwng is not one of the openings that must be blocked when food moves from the pharynx into the esophagus? | oropharynx |
| which of these is not an example of mechanical digestion? | moistening the food |
| the hormone thought to be a messenger causing release of digestive enzymes from the intestinal mucosa is: | vaso-active intestinal peptide |
| the process of fat emulsification consists of: | breaking fats into small droplets |
| which of the processes of mechanical digestion involves the esophagus? | deglutition and churning |
Created by:
lyannaher