Give occurence and functions of the following:-
a)Fluid connective tissue
Blood
Lymph
b)Nervous tissue
plz explain fast
today is my final exam.....
Answers
a) Fluid connective tissue
i) Blood
- Blood has a fluid matrix called plasma , in which RBCs , WBCs and platelets are suspended.
- The plasma contains proteins , salts and hormones.
- Blood floats and transport gases , digested food, hormones and wasted materials to different parts of body.
ii) Lymph
- It is a colourless fluid that is filtered out of blood capilaries . Its composition is similar to blood accept RBCs and some blood clottings are absent in it.
- In lymph WBCs are found in abundace.
- Lymph is present in intercellular spaces of tissues hence it is called as tissue fluid.
- It brings CO2 and nitrogenous waste from tissue fluid to blood.
- It protects the body against infection .
- It forms the defence or immune system of the body.
b) Nervous Tissue
- Cells of nervous tissue are highly specialised for being stimulated and then transmitting the stimulus very rapidly from one place to another within the body.
-The cells of this tissue are called nerve cells or neurons. A neuron consists of a cell body with a nucleus and cytoplasm , from which a long thin hair - like parts arise .
- Each neuron has single long parts called the axon and many short branched parts called dendrites.
- An individual nerve cell may be up to a metre long . Many nerve fibres bound together by connective tissue make up a nerve .
- Nerve impulses allow us to move our muscles when we want to.
- The functional combination of nerve and muscles tissue enables animals to move rapidly in response to stimuli.