Top 50+ Solved Nerves and Muscles MCQ Questions Answer

a. decreasing the external Na+ concentration increases the size of the action potential

b. decreasing the external K+ concentration decreases the resting membrane potential

c. increasing the external Na+ concentration decreases the resting membrane potential

d. decreasing the external K+ concentration has little effect on the resting membrane potential

e. none of the above are true

a. acetylcholine

b. stretch

c. cold

d. noradrenaline

e. parasympathetic stimulation

a. it contributes to 10% of body weight

b. can easily be measured by radioisotope chromium

c. if the plasma volume is known, the blood volume can be calculated by multiplying100-HCT/100

d. measured by injecting Evans blue

e. the average plasma volume is 500ml

a. the ECF represents 20% of body weight

b. the blood volume represents 8% of the body weight

c. the 2/3 of the body water is in ICF

d. 18% of the body weight is protein

e. the transcellular fluids contribute to 5% of the body weight

a. diffusion depends on concentration gradient of the solutes

b. osmotic pressure of a solution is inversely related to the volume of the solution

c. when 5% dextrose is infused, it becomes hypotonic to the plasma in the body

d. osmolality is defined as osmotically active particles in 1L of solution

e. osmolality is defined as a number of osmotically active particles in 1kg of solvent

a. the diameter of the cell membrane is about 7.5nm

b. 50% of the cell membrane is made up of proteins

c. the main lipids of the cell membrane are phospholipids

d. the hydrophilic ends of the lipid molecules are faced towards the interior of the cell membrane

e. the proteins in the cell membrane function as carriers, ion channels, enzymes and receptors

a. 99% of mitochondrial proteins are products of mitochondrial DNA

b. the outer membrane of the mitochondria is folded to form cristae

c. the space between the outer and inner mitochondrial space is called matrix space

d. it is the sperm which contributes to the formation of mitochondria in the zygote

e. the synthesis of ATP in the mitochondria is triggered by diffusion of H+ from matrix to intracristal space

a. fast fibres have small number of mitochondria

b. fast fibres are called white muscles

c. the glycolic processes are more important in energy supply in fast fibres

d. slow fibres are also called red fibres

e. fast fibres have more extensive blood supply than slow fibres

a. not having actin/myosin

b. not having striated appearance

c. not using ATP for contraction

d. not using Ca2+ for contraction

e. not having sarcoplasmic reticulum

a. tropomysin

b. actin

c. myosin

d. troponin

e. mitochondria

a. initial segment of axon

b. nodes of Ranvier

c. cell body

d. terminal buttons

e. myeline sheath

a. group A – motor

b. group C

c. group B

d. pre ganglionic-autonomic

e. muscle spindle fibres

a. normal resting membrane potential is -40mV

b. initial rapid depolarisation is due to rapid influx of Ca2+ via fast channels

c. during depolarisation, Na+ permeality is greater than K+ permeality

d. hyperpolarisation is due to continuous opening of Na+ channels

e. plateau is formed by slow Ca2+ channels

a. it always transports substances in one direction

b. energy required is obtained by Na+ /K+ ATPase pump

c. a good example is Na+ / glucose co-transport

d. Na+ / Ca2+ antiport is an example of secondary active transport

e. secondary active transport occurs in renal tubules

a. it is electrogenic in nature

b. it is important in maintaining cell volume

c. plays a major role in secondary active transport

d. it is the main factor which determine the resting membrane potential

e. it is an example of primary active transport