Question

I have attached two photos. Pls read the underlined words and then explain me how the diagram follows the statements. As for me diagram is a bit alter according to the statements!

Answer 1

Answer:

Arises from Cyton means to come out from yhe main cell body. The Axons come out through dendrites and attach other cell body to it by synapses

Answer 2

♕ ${ \huge{ \purple{ \underbrace{ \rm{Explanation}}}}}$♕

${ \blue{\underline{\boxed{\tt{\gray{ Central \: Nervous \: System = Brain + Spinal \: Cord}}}}}}$

Brain and spinal cord are made up of nervous tissues.

Nervous tissue is made up of special nerve cells called neurons and glial cells (Glial cells are supporting cells).

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Let's see the structure of Neuron and types of Neurons.

${ \blue{ \tt{ \small{What \: is \: neuron?}}}}$

Neurons are the electrically excitable cells which receive, process and transmit information between nervous system and body parts.

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$\blue{ \tt{ \small{Structure \: of \: Neuron :-}}}$

Cyton or cell body has nucleus and cytoplasm.

$\purple{ \sf{ Dendrons \blue{(Structure) :-}}}$

• The thread-like branches extending from all the sides of the cell body are called dendrons.

• Dendrons further divide to form dendrites.

• Some granules can be seen floating in cyton (cell body of neurons). These granules are called Nissl's granules. Nissl's granules are the site of protein synthesis.

$\blue{ \sf{Function :-}}$

➯They conduct nerve impulses towards the cell body, which means messages to the neuron are conveyed by the dendrites or you can say dendrites receive information from the another cell and transmit the messages to the cell body.

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$\sf{ \purple{Axon \blue{(Structure) :-}}}$

• One of the dendrons is usually longer than the rest and is called Axon.

• It is a single, long cylindrical process, which means it is single (one) unlike dendrites and is long with cylindrical shape.

$\blue{ \sf{Function :-}}$

➯It conducts the nerve impulses away from the cyton, to the another neuron or other cells, that means messages from the neuron are conveyed through the Axon or you can say it conducts messages away from the cell body and it transmits to the another neuron or another cell.

Both Dendrons and Axon arise from the cell body (cyton).

${ \purple{ \rm{Types \: of \: Axons :-}}}$

❍ Such neurons which has myelin sheath are called myelinated neurons.

❍ Such neurons which do not have myelin sheath are called non-myelinated neurons.

$\boxed{ \small{ \gray{ \rm{Myelin \: Sheath \: is \: an \: additional \: fatty \: sheath.}}}}$

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$\purple{ \rm{Types \: of \: Neurons :-}}$

A. ⚘ Sensory neurons (Afferent neurons) : They carry the nerve impulse from different parts of the body to CNS (Central Nervous System).

B. ⚘ Motor neurons (Efferent neurons) : They carry the nerve impulse from the CNS to different body parts.

C. ⚘ Connecting neurons (Interneurons) : They carry the nerve impulse from sensory neurons to motor neurons.

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$\blue{ \bf{\dag{\underline{\underline{Strange \: Fact }}}}}$

Neuron is the longest cell.

• It can extend up to 1 metre in humans.

• In animals like elephant can extend up to 3 metres.

• In blue whales, it can extend to 30 metres.