2016 physiology Flashcards
What is the osmolarity of 250ml 0.9% nacl added to 500ml 3% nacl solution? (Mwt nacl=58.5)
a. 300 b. 368
c. 786.3
c. 786.3
Poor circulation to the tissue may result in a reduction in energy for the cells. This causes intracellular water retention (intracellular edema). What may cause this?
Na+/K+ ATPase reduction
100-gram tissue left to dry and its weight became 90 grams what is the type of this tissue?
Fat
the expression of which protein allows iron ions to leave the cell?
a. transferrin
b. transferrin receptor
c. ferroportin
d. ferritin
c. ferroportin
what are gap junctions made of
a. Cadherins
b. Selectins
c. Integrins
d. Connexins
d. Connexins
80% of a muscle contracted. The sarcomere original length is 2.4micrometre and A band size is 1.6. What’s the length of I band at the end of contraction?
a. 0.64
b. 1.92
c. 1.6
d. 2.4
a. 0.64
- 4-1.6= 0.8
- 8X80%= 0.64
what is the function carried by activated JAKs?
Recruitment of STAT
What is the function of myosin 1 in actin myosin interaction?
Regulation of tension
What is the function of microtubule-associated proteins?
a. Regulation of microtubule assembly
b. ATP binding
c. Transport of vesicles to the nucleus
d. Control microtubule organization
d. Control microtubule organization
if the mean femoral artery pressure is 90 mmhg and the femoral vein pressure is 7 mmhg with blood flow of 280 What is the Resistance? a. 0.17 b. 0.30 c. 0.40 d. 0.68
b. 0.30
use Blood Flow X Resistance = Pressure difference
What neurotransmitters is released by the postganglionic neurons of the sympathetic nervous system to innervate blood vessels in the skeletal muscles?
a. acetylcholine
b. glutamate
c. dopamine
d. noradrenaline
a. acetylcholine
Which physiological process leads to synaptic depression in short term synaptic plasticity?
a. Increased residual calcium in the presynaptic compartment
b. Reduced amount of releasable NTs
c. Reduced response by post synaptic receptors
d. Saturation of post synaptic receptors
b. Reduced amount of releasable NTs
What’s the normal response of a healthy person during heat stress?
a. reduced BMR
b. increased vasoconstriction
c. increased metabolic heat production
d. increased blood flow to the skin
d. increased blood flow to the skin
a person voluntarily stopped breathing for a short period of time resulting in accumulation of CO2. After checking his blood pH, it was within the normal range and it didn’t change much. What is the reason behind this minimal change in his extracellular fluid pH?
a. bicarbonate
b. hemoglobin
c. phosphate
b. hemoglobin
can’t be bicarbonate because it’s one of its components. Buffers don’t buffer their own components
A man exercising in a high amplitude, what is the acid-base order most likely to occur?
a. Metabolic alkalosis
b. Metabolic acidosis
c. Respiratory acidosis
d. Respiratory alkalosis
d. Respiratory alkalosis
