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Medical Post Graduation | Physiology
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Questions
Inhibition of Na+, K+-ATPase would result in increased
ক
Intracellular Ca++ concentration
খ
Intracellular Na+ concentration
গ
Intracellular K+ concentration
ঘ
Na+-glucose cotransport
ঙ
Na+-Ca++ counter transport
Positive feedback is useful in
ক
Blood clotting
খ
Child birth
গ
Generation of nerve signals
ঘ
Regulation of CO2 in ECF
ঙ
Regulation of blood pressure
Substances that enter cells by simple diffusion are
ক
Oxygen
খ
Carbon dioxide
গ
Nitrogen
ঘ
Glucose
ঙ
Aminoacid
Simple diffusion and facilitated diffusion share the following characteristics
ক
Do not require ATP
খ
Saturation kinetics
গ
Transport solute along concentration gradient
ঘ
Can be blocked by specific inhibitors
ঙ
Require transport protein
Weight lifting can result in a dramatic increase in skeletal muscle mass. This increase in muscle mass is attributable to
ক
Fusion of a sarcomeres between two adjacent myofibrils
খ
Hypertrophy of individual muscle fiber
গ
Increase in skeletal muscle blood supply
ঘ
Increase in the number of glycolytic enzymes
ঙ
Increase in the number of neuromuscular junctions
Primary active transport of hydrogen ion proton pump occurs in
ক
Gastric glands
খ
Cortical collecting ducts of the kidneys
গ
Osteoclasts of bone
ঘ
Ventricles of the brain
ঙ
Capillaries in the lungs
Substances entering cells through simple diffusion are
ক
Oxygen
খ
Carbon dioxide
গ
Long chain fatty acid
ঘ
Glucose
ঙ
Amino acid
Examples of active transport include
ক
Na+ reabsorption in the distal tubules of the kidney
খ
Ca++ uptake by sarcoplasmic reticulum of muscles
গ
Movement of O2 from pulmonary alveoli into blood
ঘ
Uptake of LDL cholesterol by the cells
ঙ
Chloride shift between RBC and plasma
The examples of active transport are
ক
Na+- K+ pump in cell membrane
খ
Na +- H+ exchange in distal convoluted tubular cells
গ
Na+ linked glucose uptake by the enterocytes
ঘ
Cl-- HCO3- exchange in RBC membrane
ঙ
Na+- K+ leaking in the cell membrane
During isotonic contraction of skeletal muscle, shortening occur in
ক
H band
খ
I band
গ
Sarcomere
ঘ
A band
ঙ
M line
Secondary active transport
ক
Allows the movement of molecules against their electrochemical gradients.
খ
Allows the movement of molecules by conformational changes is carrier proteins.
গ
Uses energy created by electrochemical gradient.
ঘ
Uses cellular ATP.
ঙ
Is a form of passive transport.
Na+- K+ pump
ক
Cell volume is maintained.
খ
Constant pumping activity is carried out in all cells.
গ
Na+ is actively transported into the cell.
ঘ
K+ is passively transported into the cell.
ঙ
Equal number of Na+ - K+ is transported.
Endocytosis is initiated by
ক
Coated pits.
খ
Clathrin coated vesicles.
গ
Non-clathrin coated vesicles.
ঘ
Endosomes
ঙ
Lysosomes
The organelles which incorporate a unit membrane are
ক
Golgi apparatus
খ
Lysosome
গ
Actin
ঘ
Nuclear envelope
ঙ
Ribosome
Refractory period in the ventricles corresponds to the
ক
Period of ventricular contraction
খ
Period of ventricular action potential
গ
QRS complex of ECG
ঘ
PR interval of ECG
ঙ
ST segment of ECG
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