Answer:
The head of the sperm contains the nucleus. The nucleus holds the DNA of the cell. The head also contains enzymes that help the sperm break through the cell membrane of an egg. The midpiece of the sperm is packed with mitochondria.
Explanation:
sympathetic nervous system<span> can accelerate heart rate; widen bronchial passages; decrease motility (movement) of the large intestine; constrict blood vessels; </span>increase<span> peristalsis in the esophagus; cause pupillary dilation, piloerection (goose bumps) and perspiration (sweating); and raise blood pressure </span>
Answer
If Richard’s friend jumps in front of him and scares him, Richard’s sympathetic nervous system will take over and his parasympathetic nervous system will have a lesser role.
Explanation
The sympathetic nervous system is responsible for the activation of the flight/fight response. The extensive network of neurons regulates the involuntary processes of the body. Through the autonomic nervous system actions that occur without voluntary control are mediated. For example heart rate. The sympathetic and parasympathetic nervous systems complement each other will working.
