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Cscc: Physiology Exam One Questions And Answers With Verified Solutions 100% Correct!!!
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Cscc: Physiology Exam One Questions And Answers With Verified Solutions 100% Correct!!!
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Cscc: Physiology Exam One QuestionsAnd Answers With Verified Solutions
100% Correct!!!
Tonicity - ANSWER✔✔concentration of solvents
Passive mechanisms of transport - ANSWER✔✔high to low, does NOT need ATP
Example: Osmosis, Diffusion, Facilitated Diffusion
Active mechanism of transport - ANSWER✔✔"up hill" *Thats why it needs the
energy and pump for help*
low to high, does need ATP, uses proteins or pumps
Example: Primary and Secondary
Primary active transport - ANSWER✔✔Use ATP (and a pump) to move a protein
Secondary active transport - ANSWER✔✔"coupled transport"
moving sodium back into the cell, ATP is used
What factors influence the rate of diffusion - ANSWER✔✔temp (hot speeds, cold
slows)
molecular mass (small speeds, large slows)
number of carriers (the more carriers, the faster)
concentration gradient (the more, the slower)
solubility (lipid soluble is faster)
surface area (the more surface area, diffusion increases)
,Osmosis - ANSWER✔✔diffusion of water, from low concentration of solutes, to
high
How do you calculate the osmolarity of solution when given the molarity? -
ANSWER✔✔multiply the molarity by the number of solutes
Hyper tonic - ANSWER✔✔H2O moves out of cell, and crenates
More than 0.3 Osmoles
Hypo tonic - ANSWER✔✔H2O moves into the cell, and lyses
Less than 0.3 Osmoles
Isotonic - ANSWER✔✔equilibrium, =0.3 Osmoles
Non penetrating solutes - ANSWER✔✔do not go through the semi permeable
membrane
Nodes of Ranvier - ANSWER✔✔space between myelin sheath, jumps from one to
another; thus speeding us the axons signal
Axon terminal/ Synaptic end bulbs - ANSWER✔✔responsible for releasing the
neurotransmitter into synapse
Neurotransmitter - ANSWER✔✔chemical messenger between cells
, Resting membrane potential - ANSWER✔✔-70 mV, When the cell is at rest. More
negative inside
What conditions cause the resting membrane potential - ANSWER✔✔the
potassium and sodium pump, an abundance of large, negative cells (proteins and
phosphates), and leaky potassium
Whats the ion concentration of the cell (inside and outside) -
ANSWER✔✔Outside: more sodium
Inside: more potassium
What is the importance of the potassium pump? - ANSWER✔✔It restores the
resting potential!
*CRITICAL FOR NEURONS AND MUSCLES because produces electrochemical
impulses*
3 sodium (NA+) "kicked" out
2 potassium (K+) "pulled" in
potassium constantly, passively leaking out
Depolarization - ANSWER✔✔-55, threshold is reached, gates open and sodium
enters rapidly and potassium leaves (becomes more positive)
Re-polarization - ANSWER✔✔has already reached potential and is noe returning
to resting potential, ranges from +30-(-70)
Hyper-polarization - ANSWER✔✔-85, over shoot resting potential, NA+ and K+
quickly reestablish resting potential
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