All are features of skeletal muscle except______________?
(A) Cylindrical
(B) Transverse striation
(C) Centrally placed nuclei
(D) Multiple nuclei
In excitable cells, repolarization is closely associated with, one of the following events_______________?
(A) Na effux
(B) Na influx
(C) K efflux
(D) K influx
The end plate potential is characterized by_____________?
(A) Propagation
(B) All or none law
(C) Depolarization
(D) Hyper polarization
The number of muscle fibers in a motor unit are least in______________?
(A) Laryngeal muscles
(B) Pharyngeal muscles
(C) Muscles of middle ear
(D) Extraocular muscles
Increase in threshold level on applying subthreshold, slowly rising stimulus is known as ___________?
(A) Adaptation
(B) Accommodation
(C) Refractoriness
(D) Electrotonus
The absolute refractory period of an action potential is due to _______________?
(A) Insufficient neurotransmitter
(B) Depletion of intracellular Na+
(C) Inactivation of Na+ k+ ATPase
(D) Voltage inactivation of the Na+ channel
Two major types of muscle fibres are found in humans_____________?
(A) white and brown
(B) White and yellow
(C) White and gray
(D) White and red
The main types of muscle cells are______________?
(A) Skeletal and cardiac
(B) Smooth and cardiac
(C) Smooth and skeletal
(D) All of the above
Upstroke of action potential would lead to________________?
(A) Net current in an outward direction
(B) Cell interior becomes more negative
(C) Cell interior becomes less negative
(D) None of the above