Statements about the mechanism of muscle contraction are given below. I. Acetylcholine is released when the neural signal reaches the motor end plate. II. Muscle contraction is initiated by a signal sent by CNS a sensory neuron. III. During muscle contraction isotropic band gets elongated. IV. Repeated activation of the muscles can lead to lactic acid accumulation. Identify the correct statement. |
|
a) |
I and IV are correct |
b) |
I and III are correct |
c) |
II and III are correct |
d) |
I, II, and III are correct |
Statements about the mechanism of muscle contraction are given below. I. Acetylcholine is released when the neural signal reaches the motor end plate. II. Muscle contraction is initiated by a signal sent by CNS a sensory neuron. III. During muscle contraction isotropic band gets elongated. IV. Repeated activation of the muscles can lead to lactic acid accumulation. Identify the correct statement. |
|
a) |
I and IV are correct |
b) |
I and III are correct |
c) |
II and III are correct |
d) |
I, II, and III are correct |
(a)
The junction between a motor neuron and the sarcolemma of the muscle fiber is called the neuromuscular junction or motor-end plate. A neural signal reaching this junction (motor-end plate) releases a neurotransmitter (acetylcholine) which generates an action potential in the sarcolemma.