Phys lecture exam 1 practice 2: – Flashcards

in facilitated diffusion a molecule is moved where

body fluid compartment with a high potassium concentration is called

which of the following components of the plasma membrane forms ion channels? a. transmembrane proteins b. transmembrane glycolipids c. peripheral membrane d. cholesterol e. phospholipids

what transport process couples the movement of a molecule against its electrochemical gradient to sodium that is moving down its electrochemical gradient that was established using cellular energy? (ATP)

as an action potential is propagated away from the axon hillock why does propagation continue in only one direction?

which of the following neurotransmitters is most common in the PNS? a. acetylcholine b. glycine c. norepinephrine d. asparate

what happens to the resting membrane potential of -70 mV when voltage gated sodium channels open?

direct communication between cells in contact with one another is accomplished through (blank) a. endocrine hormones b. ligands c. gap junctions d. receptors

which of the following will not affect the magnitude of a cells response to a messenger? a. number of receptors for the messenger b. relative size of the messenger c. messenger concentration d. receptor up regulation e. affinity

which of the following is not found in the plasma membrane? a. nucleic acids b. carbohydrates c. phospholipids d. cholesterol e. proteins

what determines the strength of a graded potential?

what is a change in the postsynaptic potential that brings the membrane potential closer to threshold?

what is a molecule that is similar in structure to a messenger and binds with that messengers receptor, but blocks a response from the target cell

nitric oxide is a (blank) that functions as a neurotransmitter

what organelle packages and directs proteins to their proper destination?

where in the CNS do the preganglionic neurons of the parasympathetic NS originate?

which area of the brain relays sensory info to the cerebral cortex?

the influx of calcium into the axon terminal of a chemical synapse is responsible for which of the following? a. diffusion of the neurotransmitter across the membrane into the cleft b. fusion of synaptic vesicles to the membrane and the release of the neurotransmitters c. initiation of action potential

in myelinated nerve axons where do action potentials occur?

primary role for the Na/K pump

how does cobra neurotoxin found in venom cause muscle paralysis?

during repolarization phase of an action potential the axon membrane is more permeable to which ion?

which of the following compartments contains most of the water found in the body? a. intracellular fluid b. lumen of the GI tract c. plasma d. interstitial fluid

what type of glial cell is necessary for the maintenance of the blood brain barrier?

at threshold the electrochemical gradient for sodium across the membrane is such that the net flux for sodium movement is directed (blank) thereby causing the cells membrane potential to become more (blank)

what is the neurotransmitter released from motor neurons?

which of the following is associated with endocrine glands? a. ducts b. autocrine mode of action c. hormones d. paracrine mode of action e. exocrine

the function of the second messenger system is to what?

when your mind is racing at night and you cannot fall asleep what region of the brain is keeping you awake?

which primary tissue type includes cells contained in an extracellular matrix composed of collagen and elastin?

what tissue covers the body and lines hollow organs

what is the most common ion in secondary active transport

which of the following proteins is activated by a G protein? a. tyrosine kinase b. phospholipase c. ion leak channel d. adenylate cyclase

if the solution on either side of a membrane have an unequal distribution of charged ions, with the inside having an excess of anions then the inside of the cell would be

this area of the brain is involved in hunger, thirst, thermoregulation and other homeostatic measures

how can action potentials relay info about the intensity of a stimulus such as warm vs hot?

which of the following are a type of cholinergic (acetylcholine) receptors?

what type of ion channel is located along the axon of neurons and allows for the generation of action potentials? a. mechanical channel b. voltage-gated channels c. initation channels d. ligand gated

to maintain homeostasis a (blank) detects a change in a regulated variable and sends that to (blank) which relays signals to a (blank) usually a muscle or gland

the affinity of a receptor for its messenger is a measure of what?

what portion of the efferent nervous system communicates with skeletal muscle?

a change in the postsynaptic membrane that brings it away or further from threshold is what?