Question

Neurons that carry impulses from the eyes to the spinal cord and brain are called 5. motor neurons carry impulses from the brain and spinal cord to and 6. the neuron's cell body has short, branched extensions called which receive impulses from other neurons. 7. in most animals, and of different neurons are clustered in bundles called nerves. 8. the insulating membrane that surrounds a single axon in some neurons is called the .

Answer 1

4. The neurons that carry impulses from the eyes to the spinal cord and brain are called the Sensory neurons. Sensory neurons are nerve cells within the nervous system responsible for converting external stimuli from the organism's environment into internal electrical impulses.

 5. Motor neurons carry impulses from the brain and spinal cord to and from the Muscles and glands. The motor neurons transmit impulses from the spinal cord to skeletal and smooth muscles, and therefore directly control all of our muscle movements. There are two types of motor neurons, those that travel from spinal cord to muscle (lower motor neurons) and those that travel between the brain and spinal cord (upper motor neurons)

6. The neuron's cell body has short, branched extensions called dendrites. Dendrites are tree-like extensions at the beginning of a neuron that help increase the surface are of the cell body. They receive information from other neurons and transmit electrical stimulation to the soma (cell body). They are also covered with synapses.

7. In most animals and of different neurons are clustered in bundles called nerves Axons and dendrites. Axon is the elongated fiber that extends from the cell body to the terminal endings and transmits the neural signal. The larger the diameter of the axon, the faster it transmit information. Most neurons have only one axon, they transmit impulses from the cell body and also may or may not have a myelin covering.

8. The insulating membrane that surrounds a single axon in some neurons is called the Myelin sheath. The myelin sheath is a protective covering that surrounds fibres called axons, the long thin projections that extend from the main body of anerve cell or neuron. It is composed of proteins and lipids. The main function is to protect and insulate these axons and enhance their transmission of electrical impulses.

Answer 2

The neuron that transmits the impulse is called the presynaptic cell and the cell receiving the impulse is called the postsynaptic cell

When a nerve impulse arrives at the axon terminal of the neuron, it triggers the release of molecules called neurotransmitters These molecules diffuse across the synapse and bind to receptors on the next cell.