Objective 9
Describe the structure of the human nervous
system.
Explanation:
The human nervous system is the body's way of communicating between the world and body tissues. It is made of the peripheral and central nervous systems and neurons. The CNS is the brain and spinal cord and the PNS is the sensory and motor neurons that connect the CNS to the rest of the body. The CNS is the body’s decision maker while the PNS gathers information and transmits the CNS's decisions to other body parts. Information travels in the nervous system through three types of neurons. They are motor neurons, sensory neurons, and interneurons. The motor neurons carry instructions from the CNS out to the muscles and the sensory neurons carry messages from the body’s sensory receptors to the CNS. The interneurons can communicate between sensory inputs and motor outputs. The PNS is divided into two parts. They are the somatic nervous system and the autonomic nervous system. The somatic nervous system is in control of voluntary movements of skeletal muscles, and the autonomic nervous system controls muscles of our internal organs like heartbeat. Then the autonomic nervous system is divided into two parts, the sympathetic nervous system and the parasympathetic nervous system. The sympathetic nervous system arouses us while the parasympathetic nervous system calms us. Our nervous system is what keeps us alive and functioning, so it is really important.
The human nervous system is the body's way of communicating between the world and body tissues. It is made of the peripheral and central nervous systems and neurons. The CNS is the brain and spinal cord and the PNS is the sensory and motor neurons that connect the CNS to the rest of the body. The CNS is the body’s decision maker while the PNS gathers information and transmits the CNS's decisions to other body parts. Information travels in the nervous system through three types of neurons. They are motor neurons, sensory neurons, and interneurons. The motor neurons carry instructions from the CNS out to the muscles and the sensory neurons carry messages from the body’s sensory receptors to the CNS. The interneurons can communicate between sensory inputs and motor outputs. The PNS is divided into two parts. They are the somatic nervous system and the autonomic nervous system. The somatic nervous system is in control of voluntary movements of skeletal muscles, and the autonomic nervous system controls muscles of our internal organs like heartbeat. Then the autonomic nervous system is divided into two parts, the sympathetic nervous system and the parasympathetic nervous system. The sympathetic nervous system arouses us while the parasympathetic nervous system calms us. Our nervous system is what keeps us alive and functioning, so it is really important.
Example:
This picture is a good example of the structure of the human nervous system. It is a hierarchy showing what systems make other systems. It shows what my explanation said.
This picture is a good example of the structure of the human nervous system. It is a hierarchy showing what systems make other systems. It shows what my explanation said.
Example:
This picture is a good example of what the sympathetic and the parasympathetic nervous systems do. The sympathetic nervous system arouses the body and does things like dilate the pupils, secrete epinephrine and norepinephrine, and inhibit digestion. The sympathetic nervous system makes you alert and ready for action. The parasympathetic nervous system calms you by slowing the heartbeat, stimulating digestive activity, and contracting the bladder. The parasympathetic nervous system calms you and conserves energy.
This picture is a good example of what the sympathetic and the parasympathetic nervous systems do. The sympathetic nervous system arouses the body and does things like dilate the pupils, secrete epinephrine and norepinephrine, and inhibit digestion. The sympathetic nervous system makes you alert and ready for action. The parasympathetic nervous system calms you by slowing the heartbeat, stimulating digestive activity, and contracting the bladder. The parasympathetic nervous system calms you and conserves energy.