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WorksheetsPHYSIOLOGY - QUIZ
Total questions: 20
Worksheet time: 21mins
A 40-year-old diabetic man who presented with diabetic ketoacidosis is started on an intravenous insulin infusion. A repeat serum chemistry analysis shows a decrease in K+ level in blood. What is the effect on the
cellular membrane when the extracellular concentration of K+ is decreased?
Increased positivity of the
membrane
Increased negativity of RMP
Decreased fluctuations in
RMP
Decreased negativity of
membrane
Which of the following
is not a feature of cardiac
muscle?
All or none phenomenon
Length-tension relationship
Tetanization
Plateau potential
Muscles in hollow viscera
behave as
Single unit smooth muscle
Multiunit smooth muscle
Both, depending on action
None
Identify the condition in which this sign is present
Lambert-Eaton syndrome
Myasthenia gravis
Duchenne muscular dystrophy
Parkinson disease
A sprinter would experience muscle fatigue sooner than a marathon runner due to
anaerobic metabolism in the muscles of the sprinter
anaerobic metabolism in the muscles of the marathon runner
aerobic metabolism in the muscles of the sprinter
glycolysis in the muscles of the marathon runner
Which cell type helps to repair injured muscle fibres?
ganglion cells
myotube cells
myoblast cells
satellite cells
Which of the following proteins is present in skeletal muscles, but absent in a smooth
muscle?
Troponin
Tropomyosin
Actin
Myosin
Which of the following statements are correct regarding mechanisms of
depolarisation, repolarisation, and hyperpolarisation in a skeletal muscle action
potential?
1. Depolarisation due to influx of Na+ through voltage-gated channels
2. Depolarisation due to influx of Na through ligand-gated channels
3. Repolarisation due to efflux of K+ through a voltage-gated channel
4. Repolarisation due to efflux of K+ through a ligand-gated channel
5. Hyperpolarisation due to efflux of K+
2 and 4 are correct
1, 3, and 5 are correct
1,4, and 5 are correct
2, 4, and 5 are correct
ATPase activity is present in
Myosin Head
Myosin Tail
Actin filaments
Desmin filaments
A scientist found that the latent period of muscle twitch is 10 ms and the contraction
period is 40 ms. What is the tetanizing frequency (Hz)?
25
50
100
75
Which of the following occurs during skeletal muscle contraction?
A band shorten
Both H and I band shorten
Both A and I band shorten
Both A and H band shorten
Human cardiac muscle contains
Alpha heavy chain of Myosin
Beta heavy chain of Myosin
Both a and b
None
In human skeletal muscles, calcium ions are stored in?
Terminal cistern
Sarcolemma
Transverse tubules
All are correct
In a 100-m dash, most of the energy consumed by skeletal muscles to replenish ATP is
derived from
Phosphocreatine
Aerobic glycolysis
Oxidation of Fatty acids
None of the above
A motor unit is made up of
All the muscle fibers within a given muscle
A motor neuron and the muscle fibers it innervates
All the neurons going into an muscle of the body
A fascicle and a nerve
Calmodulin is mostly both structurally and functionally related to
Actin
Myosin light chain kinase
Troponin C
Tropomyosin
A sustained contraction with little expenditure of energy is made possible by a
latching mechanism in
Skeletal muscle
Smooth muscle
Cardiac muscle
All of the above
Which of the following is used to calculate the equilibrium potential for diffusion of
multiple ions?
Gibbs-Donnan equation
Nernst equation
Goldman equation
Henderson equation
How is an electrical synapse different from a chemical synapse?
No cytoplasmic continuity between presynaptic and postsynaptic membrane
Direction of impulse is unidirectional
Connexons are involved in electrical synapse
Electrical synapse has more latent period than chemical synapse
What process is responsible for the change in membrane potential that occurs between
point 1 and point 3?
Movement of Na+ into the cell
Movement of Na+ out of the cell
Movement of K+ into the cell
Movement of K+ out of the cell
