Muscle Contraction Signal from CNS
Muscle contraction is a complex process initiated by nerve impulses originating from the central nervous system (CNS). These impulses travel along motor neurons to the muscle.
Neuromuscular Junction Transmission
At the junction between a motor neuron and a muscle fiber, called the neuromuscular junction, the nerve impulse triggers the release of a specific chemical messenger. This messenger diffuses across the synaptic cleft and binds to receptors on the muscle cell membrane.
- The binding process initiates an electrical signal in the muscle fiber.
- This electrical signal leads to the release of calcium ions within the muscle cell.
- The increased calcium concentration ultimately causes the muscle proteins to slide past each other, resulting in contraction.
Neurotransmitter Role
The primary neurotransmitter responsible for initiating this signal transmission at the neuromuscular junction is acetylcholine. The CNS releases acetylcholine to signal the muscle to contract.
Conclusion
Therefore, the signal released by the central nervous system to initiate muscle contraction is acetyl choline.
Similar Questions
- In humans, respiration occurs in the following steps. Arrange these steps in the correct order.
A. Diffusion of O$_{2}$ and CO$_{2}$ between blood and tissues
B. Diffusion of O$_{2}$ and CO$_{2}$ across alveolar membrane
C. Pulmonary ventilation by which atmospheric air is drawn in and CO$_{2}$ rich alveolar air is released out
D. Cellular respiration
E. Transport of gases by the blood
Choose the correct answer from the options given below : - Match List I with List II :
List I (Respiratory Volume) List II (Capacity in mL) A. ERV (Expiratory Reserve Volume) I. 2500 - 3000 mL B. RV (Residual Volume) II. 500 mL C. IRV (Inspiratory Reserve Volume) III. 1000 - 1100 mL D. TV (Tidal Volume) IV. 1100 - 1200 mL
Choose the correct answer from the options given below : - Which of the following represents the correct sequence of arrangement of bones in the lower limb of humans ?
The number of vertebrae in a human is ____________ .
- Which of the following is the correct order of arrangement of vertebrate column from the head to toe ?
Important Questions from Human Anatomy and Physiology-I
- In humans, respiration occurs in the following steps. Arrange these steps in the correct order.
A. Diffusion of O$_{2}$ and CO$_{2}$ between blood and tissues
B. Diffusion of O$_{2}$ and CO$_{2}$ across alveolar membrane
C. Pulmonary ventilation by which atmospheric air is drawn in and CO$_{2}$ rich alveolar air is released out
D. Cellular respiration
E. Transport of gases by the blood
Choose the correct answer from the options given below : - Match List I with List II :
List I (Respiratory Volume) List II (Capacity in mL) A. ERV (Expiratory Reserve Volume) I. 2500 - 3000 mL B. RV (Residual Volume) II. 500 mL C. IRV (Inspiratory Reserve Volume) III. 1000 - 1100 mL D. TV (Tidal Volume) IV. 1100 - 1200 mL
Choose the correct answer from the options given below : - Which of the following represents the correct sequence of arrangement of bones in the lower limb of humans ?
The number of vertebrae in a human is ____________ .
- Which of the following is the correct order of arrangement of vertebrate column from the head to toe ?
