Human nervous Glandulary System

SEE | Biology | Unit-2: Human nervous and Glandulary system

Download Human nervous Glandulary System pdf file

1. Stimulas:

The external substance which can change morphology and physiology of organism is called stimulus.

example:

  • Light
  • Pressure/ touch
  • Heat
  • Gravity
  • Water
  • Flow of wind
  • Chemicals, etc.

2. Response:

The change seem in organism is called response/ reaction.

example:

  • when we touch leaves of mimosa pundica, all the leaves  are collapsed for sometimes.

Touch: stimular

Collapse leaves: Reaction/ response

  • Mole comes out from hole in night.

Night: Stimulus

Comes out from hole: Response/ Reaction

  • Ant go towards sugar:

sugar: stimulus.

Movement towards sugar: Response/ reaction.

3. Nervous system:

The system composed by nervous tissure to control and co-ordinate all parts of body is called Nervous system.

It has three types:

  • Central Nervous system (CNS)
  • Autonomous Nervous system (ANS)
  • Peripheral Nervous system (PNS)

4. Central Nervous system (CNS):

The major part of CNS is (a) Brain and (b) spinal cord.

5. Brain:

Brain is the main part of central nervous system which control memory, decesion power, thinking, hearing, laughing, vision, heart beat movement of body, etc. It controls function of all parts of body.

Its major parts are:

  • Cerebrum
  • Cerebellum
  • Mid-brain
  • Pons-veral
  • Medulla oblongate, etc.
Parts Comments
1. Cerebrum It covers 80% part of brain and called fore brain or large brain. It is divided into two hemisphere by deep tissue.

Function:

  • Thinking
  • Responding
  • Memory
  • Intelligency
  • Mood
  • Taste
  • Pain
  • Happiness
  • Love feeling
2. Cerebellum It is a small brain. It is a lemon shaped semicircular structure present behind posterior end of cerebrum.

Function:

  • It coordinates and controls voluntary body movement.
  • It maintains the balance and equilibrium of our body.
  • It maintains the muscles bone.
3. Mid-brain The mind brain is a part of brain present between cerebellum and pons-veroli.

The acts as a relay station between cerebellum and pons-veroli.

4. Pons veroli It is located between mid-brain and medulla oblongate. It works as relay station for impules.
5. Medulla oblongate It is a posterior end of brain.

The spinal cord is started from here.

Function

  • It is a center for breathing, here heat, and blood pressure.
  • It controls coughing, sneezing, vomitting swallowing, etc.
  • It acts as a bridge between brain an spinal cord.
  • It controls secretion of enzymes harmones, etc.

6. Spinal cord.

a. Definition:- The spinal cord is the nerve tissue dedicate for reffex action and it is an extension of medulla oblongata.

b. Composition:- It is composed by white grey matter. If is originated from medulla oblongata and passes through nerval canal of vertebra column. It is a cylinederical structure gradually becoming thin. It is protected by vertebral column.

c. Diagram:-

d. Function:-

  • It controls relax action
  • It is a transmission station between brain and all the parts of body.

7. Some technical terms:-

a. Meanings:- It is an outer protective cover of brain.

It is a three – layered structure. The layers are:

  • Duramater: Outer
  • Arachnoid: Middle
  • Diamater: Inner connected with brain, etc.

b. Cerebro spinal fluid:- It is a shoch absorbed fluid filled between arachnoid and perimeter.

c. Cranium:- The bony box of skull in which brain is enclosed is called cranium.

d. Cranial nerve:- The nerve originated from brain is called craniul nerve. It is 12 pair in number.

e. Spinal nerve:- The nerves originated from spinal cord is called – spinal nerve. It is 31 pair in number.

Read other notes Lok Sewa Aayog | Health Inspection – Level 4 | Question paper 2075

Leave a Reply

Your email address will not be published. Required fields are marked *