Systems of the Body function as a whole

There are three types of muscle: skeletal muscle used in movements; down muscle which lines blood vessels and many other(a) body structures; and cardiac muscle, which is the muscle of the heart. Muscle has four distinct properties which distinguish it from other tissues: excitability, contractility, extensibility and elasticity.

The restless system consists of the brilliance, spinal cord, and peripheral braces, and controls the regulatory and communication systems of the body (Applegate, 2000, 153-154). It acts with the endocrine system to maintain homeostasis, the steady secern of the body. The brain and spinal cord comprise the central nervous system, and the peripheral nerves the peripheral nervous system, which is divided into the likeable and parasympathetic systems. Stimulus along a nerve is by propagated action potentials known as nerve impulses in unmyelinated nerves and saltatory conduction in myelinated nerves (158-160).

The brain consists of both cerebral hemispheres in front, behind which are the two parietal lobes, and then the two occipital lobes and the temporal lobes, all(prenominal) lying above the mid- and hindbrain. (164). There is a longitudinal gent separating the two halves of the brain, but they are connected by the school principal callosum. The cerebrum has a thin outer layer of grey intimacy consisting of

neuron cell bodies and unmyelinated fibers, and the bulk of the cerebrum is made up of white matter, which represents myelinated nerve fibers.

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