Question

about nerve cell essay

Answer 1

Neurons are the nerve cells; they contain a cell body, an axon, and dendrites. The cell body is the part that contains the nucleus and cytoplasm. The axon is a piece that extends from the cell body; its job is to send impulses away from the cell body. Most are covered with myelin sheath. This sheath helps protect the axon and speeds the impulse. The dendrites branch off from the cell body also, their job is to send impulses to the cell body.

Neuralgia is a connective tissue that supports the neurons. Their job is to protect the nervous system. Astrocytes look like star-shaped cells; they are the biggest of the neuroglial cells in the central nervous system. Astrocytes surround the brain's blood capillaries to form blood-brain barriers which protect the brain from harmful substances. Microglia are smaller cells that eat cellular debris, waste, and pathogens in nerve tissue. Oligodendrocytes are in the interstitial nervous system, smaller than astrocytes. They wrap around axons to form myelin sheaths. As stated above, the sheaths protect the axons and speed the nerve impulses.

Describe the structures and functions of the peripheral nervous system (PNS). Be sure to include the nerves associated with the PNS, and contrast the functions of the somatic and autonomic nervous systems.

The peripheral nervous system consists of nerves, which transmit impulses from the brain to other parts of the body; and ganglion, which are masses of nerve cell bodies that connect structures. There are two main groups of nerves: the afferent nerves and the efferent nerves. The afferent nerves send information from the body to the brain. The efferent nerves send information from the brain to the muscles. The system is then broken into the somatic and autonomic nervous systems. The somatic nervous system regulates the voluntary controlled parts of the skeletal muscles, while the autonomic nervous system regulates involuntary controlled parts like smooth muscle, cardiac muscle, the glands, and secretions. The autonomic nervous system is also broken into two parts: the sympathetic and parasympathetic divisions. The sympathetic division responds when the body is in danger, increases heart rate, blood pressure, etc. The parasympathetic division is when the body is relaxed and resting. It is responsible for things like constriction of pupil, slowing of heart, and digestive syste

Answer 2

Neurons are the structural and functional units of the nervous system. They consist of a cell body, dendrites, and axon. Neurons transmit nerve impulses to other cells. Types of neurons include sensory neurons, motor neurons, and interneurons.