Презентация на тему Developmental physiology andschool hygiene

sphere
Cell reproduction
Lymph
Intercellular material

Cell

Cell-wall protoplasm (physical basis
(protection of the cell) of life)

Nucleus main body cytoplasm
(nourishment (surrounding (all parts of
and formation the nucleus) the cell)
of new cells)
attraction sphere
(cooperating with main
body to form new cells)

a hobby and used to view various specimen under

his microscope. Once, he made a thin slice of cork and observed it under the microscope. Since corks are made from the oak trees, they were made up of cells. Hooke observed numerous tiny compartments and called them "cells".
Robert Hooke (28 July 1635 – 3 March 1703) was an English natural philosopher, architect and polymath.
The cell was discovered in 1665.
The cell theory, first developed in 1839 by Matthias Schleiden and Theodor Schwann, states that all organisms are composed of one or more cells, that all cells come from preexisting cells, that vital functions of an organism occur within cells, and that all cells contain the hereditary information necessary for regulating cell functions and for transmitting information to the next generation of cells.

Cells emerged on planet Earth at least 4.0–4.3 billion years

the tissues
Living, working parts of the body
Body “individuals”.

Cells build

up the body
and carry on its
different functions.

always formed by and from the old ones.
Rule 2:
Formation

and growth of new cells lead to the full size of the body.
Rule 3:
When growth is complete, cell reproduction is supposed to stop.
Rule 4:
If tissues are injured or bones are broken the cell-reproduction continues.

in materials

Give out materials
Essential part of
protoplasm
2) No water  cells become inactive and die
3) Fluid, oxygen and food to the cells are carried by the lymph through intercellular material.

the cells to form tissues
A definite arrangement of the

tissues in the organ.
A definite arrangement of organs to form systems.
Supreme purpose:
Maintenance
of the cell group

 cell body)
1 purpose  supply protoplasm with water,

food, oxygen,

2 purpose  remove any waste materials

Remember: cells rapidly exhaust the nutrient fluid.

and excretion  maintaining the nutrient fluid for the

cells.
External: through the organs of motion and organs of special sense  bringing the body into secure relations with its surrounding and satisfying its needs.