Question

Clas
Answer the following questions.
What are the functions of the nervous system?
b. Name different parts of brain and state the functions of each.
What is a reflex action?
d. Explain the structure of the human eye.
Distinguish between motor and sensory nerves.
the following flowchart
C.
e.​

Answer 1

Answer:

HEY BUD HUMBLE REQUEST' ALWAYS SMILE! '

Explanation:

A)The nervous system is involved in receiving information about the environment around us (sensory functions, sensation) and generating responses to that information (motor functions, responses) and coordinating the two (integration).The nervous system has three broad functions: sensory input, information processing, and motor output. In the PNS, sensory receptor neurons respond to physical stimuli in our environment, like touch or temperature, and send signals that inform the CNS of the state of the body and the external environment.

B)The brain has three main parts: the cerebrum, cerebellum and brainstem. Cerebrum: is the largest part of the brain and is composed of right and left hemispheres. It performs higher functions like interpreting touch, vision and hearing, as well as speech, reasoning, emotions, learning, and fine control of movement.

C)A reflex, or reflex action, is an involuntary and nearly instantaneous movement in response to a stimulus. A reflex is made possible by neural pathways called reflex arcs which can act on an impulse before that impulse reaches the brain.

D)The main parts of the human eye are the cornea, iris, pupil, aqueous humor, lens, vitreous humor, retina, and optic nerve. Light enters the eye by passing through the transparent cornea and aqueous humor. The iris controls the size of the pupil, which is the opening that allows light to enter the lens.

E)Sensory nerve fibers in the peripheral nerves are the peripheral axonal process of neurons in the dorsal root ganglion. The motor axons are the processes of anterior horn cells of the spinal cord.[AXONS MEANING:-the long threadlike part of a nerve cell along which impulses are conducted from the cell body to other cells.]

Sensory Neuron                   Motor Neuron

• Neurons that carry sensory impulse from sensory organs to the central nervous system are known as sensory neurons.  
• A neuron that carries motor impulses from the central nervous system to specific effectors is known as motor neurons.

• They are located in the dorsal root ganglion of the spinal nerve.
• They are located in the ventral root ganglion of the spinal cord.

• It is unipolar.

• It is multipolar

• Comprises of a short axon.

• Comprises of a long axon

• An adult has an average of 10 million sensory nerves in the bodY.

• Half million of motor neurons are found in the body

• Found in eyes, skin, ears, tongue and nose.
• Found in muscles and glands

THAT'S ALL BUDDY!

Answer 2

Explanation:

a) The nervous system has three broad functions: sensory input, information processing, and motor output.

b)The brain is composed of the cerebrum, cerebellum, and brainstem .

Cerebrum: is the largest part of the brain and is composed of right and left hemispheres. It performs higher functions like interpreting touch, vision and hearing, as well as speech, reasoning, emotions, learning, and fine control of movement.

Cerebellum: is located under the cerebrum. Its function is to coordinate muscle movements, maintain posture, and balance.

Brainstem: acts as a relay center connecting the cerebrum and cerebellum to the spinal cord. It performs many automatic functions such as breathing, heart rate, body temperature, wake and sleep cycles, digestion, sneezing, coughing, vomiting, and swallowing.

c) A reflex action, is an involuntary and nearly instantaneous movement in response to a stimulus.

d) The main parts of the human eye are the cornea, iris, pupil, aqueous humor, lens, vitreous humor, retina, and optic nerve. Light enters the eye by passing through the transparent cornea and aqueous humor. The iris controls the size of the pupil, which is the opening that allows light to enter the lens.

e) The difference between sensory and motor neurons is:

Neurons that carry sensory impulse from sensory organs to the central nervous system are known as sensory neurons

A neuron that carries motor impulses from the central nervous system to specific effectors is known as motor neurons.

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