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Physiology
week 1-7
| Question | Answer |
|---|---|
| When an impulse reaches a synapse: | chemical transmitters are released |
| Excitatory neurotransmitters are most likely to: | initiate an action potential |
| During a relative refractory period: | the action potential can be initiated with a strong stimulus |
| Which is true of a neuron with a resting potential? | The sodium pump has moved Na+ to the outside of the plasma membrane |
| Which is true of an action potential? | The outside of the plasma membrane is negatively charged, and the inside is positively charged |
| Stimulus-gated channels open in response to: | sensory stimuli. |
| Acetylcholine is in the same class of neurotransmitters as: | none of the above. -- serotonin, histamine, dopamine |
| Dopamine, epinephrine, and norepinephrine are classified as: | catecholamines |
| Which of the following is true of spatial summation? | Neurotransmitters released simultaneously from several presynaptic knobs converge on one postsynaptic neuron |
| Serotonin is an example of a(n): | amine neurotransmitter |
| Most body movements are _____ contractions. | Isotonic |
| An example of a hinge joint is(are) the: | interphalangeal joints |
| An example of a pivot joint is(are) the: | head of the radius articulating with the ulna. |
| During which phase of the twitch contraction is there a triggering of the release of calcium ions into the sarcoplasm? | Latent period |
| Aerobic respiration: | produces the maximum amount of energy available from each glucose molecule |
| Skeletal muscles are innervated by: | somatic motor neurons |
| Which joint allows for the most movement? | Ball and socket |
| The first event to occur in muscle relaxation is that: | the sarcoplasmic reticulum begins actively pumping calcium back into its sacs. |
| Painful muscle contractions or involuntary twitches are called: | cramps |
| Which of the following is not a characteristic of the epiphyses? | Cylindrical in shape |
| The cell organelles that synthesize organic matrix substances in bone formation are: | endoplasmic reticulum and Golgi apparatus |
| Which type of tissue has the greatest capacity to regenerate? | Epithelial |
| The hypodermis: | connects the dermis to underlying tissues |
| Which is not a function of connective tissue? | Communication |
| A tissue is: | a group of similar cells that perform a common function. |
| Phagocytosis is an example of: | endocytosis |
| Which is not true about the sodium and potassium pump? | Sodium moves into the cell and potassium moves out of the cell |
| Which of the following is not true of diffusion? | Uses cellular energy |
| Two solutions of different concentrations of glucose are separated by a membrane that allows both glucose and water to pass through. When dynamic equilibrium is reached, there will be: | an even exchange of material across the membrane |
| All of the following occur as a result of meiosis except: | chromosome number remains at 46 |
| Which of the following is not true of RNA? | It contains deoxyribose sugar |
| Diffusion requires: | a concentration gradient |
| A structural lipid found in the cell membrane is a: | Both B and C are correct == triglyceride., phospholipid, steroid. |
| Which of the following is not true of carbohydrates? | All of the above are true of carbohydrates -- They include substances commonly called sugars., They are the body’s primary source of energy., They are a part of both DNA and RNA |
| The amino group in an amino acid is: | NH3+. |
| Unsaturated fats: | will kink or bend because of the double bonds between the carbon atoms. |
| Negative-feedback control systems: | oppose a change |
| Homeostasis can best be described as: | a state of relative constancy |
| If the secretion of oxytocin during childbirth operated as a negative-feedback control loop, what effect would it have on uterine contractions? | Oxytocin would inhibit uterine contractions |
| Negative-feedback mechanisms: | All of the above are correct -- minimize changes in blood glucose levels., maintain homeostasis., are responsible for an increased rate of sweating when air temperature is higher than body temperature. |
| Positive-feedback control systems: | accelerate a change. |
| Intrinsic control: | is sometimes called autoregulation. |
| Intracellular parasites that consist of DNA or RNA surrounded by a protein coat and sometimes by a lipoprotein envelope are called: | viruses. |
Created by:
mandiephillips
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