What statement best describes the resting state of a neuron?
A) Neurons are polarized with more sodium ions outside the cell and more potassium ions inside the cell.
B) Neurons are propagating the action potential.
C) Neurons are depolarizing and generating an action potential.
D) Neurons are restoring the ionic conditions utilizing the sodium-potassium pump.
E) Neurons are repolarizing as potassium ions diffuse out of the cell.
A
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Classify each scenario below as to primarily which type of work is being done.
1. maintaining a concentration gradient across a membrane 2. working on a dock, loading and unloading boxes into trucks all day 3. wound healing, recovering from surgery 4. enlarging one's muscles through body-building exercises 5. bringing glucose molecules inside brain cells so one can think 6. a thoroughbred horse, or greyhound dog, running around the track A. chemical work B. transport work C. mechanical work
Glomerular filtration is affected by a. blood pressure
b. plasma osmotic pressure. c. capsule pressure. d. all of the above.
The urinary bladder
a. is a temporary storage site for urine b. wall is stretched by 200 to 400 ml of urine, which stimulates stretch receptors that initiate the micturition reflex c. contracts when parasympathetic nerves stimulate it d. has all of the above characteristics e. has only characteristics a and b
A deficiency in dietary iodine can cause:
A. congenital hypothyroidism (cretinism). B. a slowing of mental functions. C. a low metabolic rate. D. a goiter. E. All of the choices are correct.