Nervous System in Human Beings

Nervious System In Human Beings

Central Nervous system includes the brain and spinal cord. The brain and spinal cord are protected by bony structure, membranes and fluids. The brain is held in cranial cavity or Skull.

Funtion of Nervous system:-The function of nerous system is to gather information from different parts of body to the brain, where the brain analysis this data and sends message to that particular region/part of the body to take action. Here comes both an internal and external environment of body.

Working.. The messages are taken from the site to the brain through neurons and the message from the brain to the site is also carried by neurons. The neurons which take information from the site ti the brain are known as Sensory nervous and the neurons which take information from brain back to the site are know as Motor nervous.

Structure and functioning of Neuron Click Here

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Structure and function of Neuron

Neurons (nerve cells) are the functional units of the nervous system. A typical neuron is divided into three parts i.e Cell body or Soma,Some contains all the cell organelles like Nucleus, Mitochondria etc. Dendrites and Axon. Schwann cells of Axon are covered by Myelin Sheath. Dendrites are branched like structures on Soma. Axon terminal is also branched like structure. The signals are received from neuron by dendrites and are send to next neuron bye chemo-electrical impulses through axon. The junction between the two cells is known as Synapses.In neuron signal travels in the form of chemicals but at synapses in changes in to electrical impulses.

Absorption of Nutrients in Small Intestines

The digested food is now in simple form and is ready to use by cells. The inner wall of small intestines is called as Mucosa, it has numerous finger like projections called as Villi (singular- villus), which in-turn has finger like projections called as micro-villi. The purpose of villus is to provide large surface area for nutrient absorption. Villi have large network of blood capillaries, where the nutrients are absorbed in blood by diffusion.Most of the nutrients are absorbed in jejunum. except Iron is absorbed in duodenum vitamin B12 and bile salts are absorbed in the terminal ileum. Through blood digested food reaches to each and every cell of the body.

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