core concepts - flow-down gradients and cell-to-cell communication pre-class quiz

Question 1

if no outside energy is involved, then things will flow from -
a) there will be no flow without outside help
b) low to high
c) high to low

Answer 1

c) high to low

Question 2

you go to the local red cross to donate blood. when you are there they take 500 ml of blood. with all other things being equal this would lead to reduced flow because
a) reduced pressure gradient
b) reduced resistance
c) flow would remain constant

Answer 2

a) reduced pressure gradient

Question 3

you are in an elevator, and much to your dismay, a lot of people get on the elevator just after you did.
assuming that each person represents a molecule, adding several people to the inside of the elevator would lead to a/n-
a) decreased resistance
b) increased gradient
c) increased resistance
d) decreased gradient

Answer 3

b) increased gradient

Question 4

a neuron talking to a muscle cell with a neurotransmitter would be an example of -
a) flow-down gradients
b) cell-to-cell communication
c) cell membrane
d) homeostasis

Answer 4

b) cell-to-cell communication

Question 5

near your house there is a water canal that you have control over. one day you decide to narrow the opening of the water that leads into the canal. narrowing the opening would lead to a/n -
a) increased gradient
b) decreased resistance
c) decreased gradient
d) increased resistance

Answer 5

d) increased resistance

Question 6

when you touch a cold surface, it feels cold. this is due to the movement of molecules which is occurring due to the
a) pressure gradient
b) temperature gradient
c) concentration gradient
d) electrical gradient

Answer 6

b) temperature gradient

Question 7

transduction is the-
a) conversion of energy from one form to another
b) changing of flow
c) changing of resistance

Answer 7

a) conversion of energy from one form to another

Question 8

hormones are used to send signals from a gland to some distant target. this would be an example of -
a) cell membrane
b) homeostasis
c) flow down gradients
d) cell-to-cell communication

Answer 8

d) cell-to-cell communication

Question 9

when it comes to flow, if you want a larger flow, you want a _________ gradient, and a _________ resistance

Answer 9

large, small

Question 10

after you eat a bunch of Starburst, your blood sugar increases. as a result of this high blood glucose, your pancreas releases insulin, which opens a bunch of glucose channels in your muscle cells. this allows sugar to move into your cell.
which core concept specifically describes the movement of sugar into your cells?
a) system integration
b) homeostasis
c) cell-to-cell communication
d) flow down gradients

Answer 10

flow down gradients

Question 11

true or false: cells can communicate with other cells using electrical signals

Answer 11

true

Question 12

after you eat a bunch of Starburst, your blood sugar increases. as a result of this high blood glucose, your pancreas releases insulin, which opens a bunch of glucose channels in your muscle cells. this allows sugar to move into your cell.
which core concept specifically describes the purpose of insulin?
a) system integration
b) cell-to-cell communication
c) homeostasis
d) flow down gradients

Answer 12

b) cell-to-cell communication

Question 13

when you donate blood, the phlebotomist places a needle into your vein. when this happens, blood goes from your vein into the vial. this occurs because
a) pressure is higher in the vein, than in the vial
b) pressure is lower in the vein, than in the vial
c) there is a tiny pump attached to the needle which pulls blood out

Answer 13

a) pressure is higher in the vein, than in the vial

Question 14

the movement of stuff is called -
a) flow
b) resistance
c) gradient

Answer 14

a) flow

Question 15

when there are sodium channels open, sodium generally moves into the cell, and not outside of the cell. what core concept explain this?
a) homeostasis
b) cell-to-cell communication
c) flow down gradients
d) cell membrane

Answer 15

flow down gradients