Nervous System Video Tutorial worksheet with questions and diagrams.

Let’s go through each question one by one.

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Question 1: Your spinal cord is part of your central nervous system.

The central nervous system (CNS) includes the brain and the spinal cord. So yes — the spinal cord is definitely part of the CNS.

✔ Correct answer: a. true

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Question 2: Cranial nerves and spinal nerves are your peripheral nervous system.

The peripheral nervous system (PNS) includes all the nerves outside the brain and spinal cord — that means cranial nerves (coming from the brain) and spinal nerves (coming from the spinal cord). So this is correct.

✔ Correct answer: a. true

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Question 3: Nerves that control heartbeat and digestion are ___ nerves.

These are automatic body functions — you don’t think about them; they just happen. That’s controlled by the *autonomic* nervous system, which is part of the peripheral nervous system.

Looking at the options:
- A. large → not a real category for nerve types here
- B. autonomic → YES! This controls involuntary things like heartbeat and digestion
- C. chemical → too vague; all nerves use chemicals to send signals, but it’s not the name of the system

✔ Correct answer: B. autonomic

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Question 4: What type of nerves connect directly to the brain?

Nerves that come straight out of the brain are called *cranial nerves*. There are 12 pairs of them. Spinal nerves come from the spinal cord. Eyes aren’t nerves — they’re organs.

So:
- A. eyes → no
- B. cranial → YES
- C. spinal → those connect to spinal cord, not directly to brain

✔ Correct answer: B. cranial

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Question 5: ___ are the chemical signals running a relay across synapses.

At the end of a neuron, there’s a gap called a synapse. To cross that gap, the neuron releases chemicals called *neurotransmitters*. These carry the signal to the next neuron or muscle cell.

Options:
- A. nerves → too general; nerves are bundles of neurons
- B. dendrites → these receive signals, not send chemical messages across synapses
- C. neurotransmitters → YES! Exactly what crosses the synapse

✔ Correct answer: C. neurotransmitters

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Final Answer:
1. a
2. a
3. B
4. B
5. C