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WEEK 7-13
SCI 221
| Question | Answer |
|---|---|
| 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 can occur only between an axon and: | cell body. another axon. dendrite. |
| True of an action potential? | The outside of the plasma membrane is negatively charged, and the inside is positively charged. |
| Within the nervous system, coding for the strength of a stimulus is accomplished through: | the frequency of nerve impulses. |
| 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 |
| Norepinephrine is liberated at: | most sympathetic postganglionic nerve endings. |
| Which of the following statements is not true? | The major function of the parasympathetic division is to serve as an “emergency” system. |
| All of the following cranial nerves are involved in proprioception | hypoglossal. accessory. abducens. |
| where do frequencies—from high to low pitches—cause activity in the hair cells within the cochlear duct? | between the base and the apex of the cochlea |
| The heart begins beating in the fetus at about what stage of development? | After about 4 weeks |
| The chemoreceptors in the carotid bodies are particularly sensitive to: | hypercapnia. |
| Fluid that is clear, watery and contains protein molecules, salts, and other substances is called | intercellular fluid |
| 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. |
| What variations exist in the body to temporarily store or carry oxygen? | neuroglobin myoglobin fetal hemoglobin |
| Hyperpnea means a(n) | increase in breathing. |
| Which of the following is a disaccharide? | Sucrose |
| The hormone that inhibits gastric muscle, slowing passage of food into the duodenum, is called: | gastric inhibitory peptide. |
| Which blood vessel carries absorbed food from the GI tract to the liver? | Portal vein |
| Which of the following is not one of the openings that must be blocked when food moves from the pharynx into the esophagus? | Oropharynx |
Created by:
Stephsimon