The sympathetic nervous system is a part of the autonomic nervous system, responsible for regulating the body's fight or flight response. It is activated during times of stress or danger, and helps prepare the body for physical activity.
The sympathetic nervous system activates major skeletal muscle by releasing neurotransmitters, such as adrenaline and noradrenaline, which bind to receptors on the muscles. This triggers a series of chemical reactions that ultimately lead to muscle contraction.
The sympathetic nervous system plays a crucial role in muscle activation by increasing heart rate and blood pressure, dilating airways to improve breathing, and redirecting blood flow to the muscles. These responses help prepare the body for physical activity and provide the necessary energy and oxygen to the muscles.
Yes, the sympathetic nervous system can activate all types of skeletal muscle, including both voluntary (striated) and involuntary (smooth) muscles. However, its effects may vary depending on the type of muscle and the specific receptors present on the muscle cells.
The sympathetic nervous system can delay muscle fatigue by increasing blood flow to the muscles and providing them with more oxygen and nutrients. It can also stimulate the release of glucose from the liver, which serves as a source of energy for the muscles. However, prolonged activation of the sympathetic nervous system can lead to muscle fatigue due to the depletion of energy stores and build-up of metabolic waste products.