O LEVEL BIOLOGY+ENGLISH

 Essay about O LEVEL BIOLOGYENGLISH

Summary

The Nervous System

The nervous approach to a mammal consists of:

The central nervous system (CNS) comprising the brain and the spinal cord. The peripheral nervous system (PNS) composed of the cranial nerves, spinal nerves and sense bodily organs. Neurone

A neurone is a nerve cellular.

A nerve fiber is a lengthy protoplasmic plug-ins of the cellular body of your neurone. This serves to transmit urges. A neural is a variety of nerve fibres.

Types of neurons

1 ) Sensory neurones:

a receptor neurone,

transmits impulses from the perception organ (receptor) to the CNS. 2 . Engine neurone:

a great effector neurone.

transmits impulses from the CNS to the effectors.

3. Relay neurone:

links sensory neurones to motor unit neurones.

Synapse

A communication is a verse between two neurones.

A dendron transmits impulses towards the cellular body of the neurone. An axon sends impulses away from the cell body system of a neurone. �

Areas of mammalian human brain

Functions

one particular

cerebrum

brains

memory

non-reflex actions

sensations

2

hypothalamus

regulation of body's temperature and blood vessels osmotic pressure

appetite

emotions

3

pituitary gland

secretes a number of human hormones

4

optic lobes

sight and motion of eyeball

5

cerebellum

muscular dexterity

physique balance

6

medulla oblongata

involuntary activities, eg:

heart beat

respiratory actions

peristalsis

Reflex Actions

Reflex actions entail messages becoming transmitted from the sensory neurone to the motor neurone with out involving the mindful part of the brain. A response arc may be the shortest path by which urges travel in the receptor towards the effector within a reflex actions. Ecosystem:

Overview

1 . Deforestation

Consequences

soil erosion

flooding

loss of home

loss of useful species

weather changes

upsets oxygen and carbon dioxide stability

2 . Smog

Caused by

burning of precious fuel

deplete fumes coming from motor vehicles

burning of waste

3. Water quality

Caused by

relieve of...

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