Secretion: epithelia’s are specialized in glands to produce exact chemical substances such as enzymes, lubricating fluids and hormones.
Absorption: some epithelial cells line the small intestine, absorbing the nutrients from food we digest.
Excretion: tissues in the kidney exonerate the waste in the body (excreting) and then absorb needed matter through urine.
Diffusion: they form a thin lining, so therefore they are ideal for diffusing gases, liquids and nutrients.
Cleaning: it removes dust particles and foreign bodies in air passages. This is done with ciliated epithelium.
Reduces friction: the tightly packed cells that line the whole system. They reduce friction from the blood and the walls of the blood vessels.
Connective Tissue:
The connective tissues are to support the body and to fix or attach together all types of tissue. This tissue also provides a framework, which is the skeleton. It plays a significant part in movement. Connective tissue can be divided into four main types.
1. Loose connective tissues (adipose tissue)
2. Dense connective tissues (tendon)
3. Support tissue (cartilage and bone)
4. Blood and blood forming tissue (red marrow)
Loose connective tissue - is a mass of widely scattered cells whose matrix is a loose weave of fibres. Loose connective tissue is found beneath the skin and between organs.
Adipose tissue - Each adipose cell stores a large bit of fat that expands when fat is stored and decreases size when the fat is used for energy.
Blood - is a free connective tissue whose matrix is liquid named plasma. Blood carries elements from one part of the body to another, and has an important part in the immune system.
Cartilage - is a connective tissue with an abundant number of collagen fibres in a rubbery matrix. It is found between the discs of the vertebrae in the spine, surrounding the ends of joints such as knees, and in the nose and ears.
Bone - a rigid connective tissue. It is the hardest tissue in the body, although it is not brittle, it protects the internal organs.
Muscle Tissue:
Muscle tissue is found all over your body. It helps you to move, make expressions, allows your eyes to focus and move. It helps to digest, amongst many others. There are three type of muscle tissue:
Skeletal: - it helps with the movement and the breathing processes.
Smooth: - regulates the blood pressure and flow of blood in the arteries. It’s also found in the digestive system, in the stomach and intestines.
Cardiac : - cardiac muscle tissue is found in the heart, causing the beating of the heart in pace and therefore helping the flow of oxygen throughout the entire body
Nerve Tissue:
Nervous tissue sense stimuli and transmit signals from one part, to help muscles to move, organs to function and such. Nerve tissue can be found everywhere in your body. The biggest masses of it are your brain and spinal cord. The main functions are:
1. Sensory input
2. Integration
3. Controls of muscles and glands
4. Homeostasis
5. Mental Activity
References
Date Accessed: 08.10.2012
Type Of Resource: Information Article
Date Accessed: 08.10.2012
Type Of Resource: Information Article
Date Accessed: 08.10.2012
Type Of Resource: Forum
Date Accessed: 08.10.2012
Type Of Resource: Forum
Date Accessed: 08.10.2012
Type Of Resource: Forum
Date Accessed: 08.10.2012
Type Of Resource: Information Article.