AP Psych 1

Good evening, afternoon, morning, night,

0:02 whenever you're watching this. Welcome back to the Mr. Sin channel. Today we're going to talk about the nervous system.

0:09

You know, that complex network of neurons, nerves, and tissues that work together to coordinate and control the body's activities. Now, if you actually

0:17 think about it, the nervous system is kind of like your body's Wi-Fi network.

0:22 It is constantly sending and receiving signals to keep everything connected and running smoothly. And just like any good

0:29 Wi-Fi network, it utilizes routers and different channels to make sure that every signal reaches its destination. So let's take a deeper look at this

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biological network to better understand the different subsystems and their functions.So our nervous system can be broken up into the central and peripheral nervous system.

Chapter 2: Central & Peripheral Nervous System

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The central nervous system, also known as the CNS, is made up of the brain and spinal cord. The CNS integrates information from different body systems.

1:04 The brain is responsible for processing sensory information, controlling motor functions, thinking, emotions, and

1:12 regulating bodily functions. While the spine acts as the communication highway,

1:17 connecting the brain to the rest of the body. On the other hand, the peripheral nervous system or PNS for short consists of different nerves that branch off from

1:26 the brain and spine. The PNS is the communication network that connects the CNS to the rest of the hech

arvous

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system is able to deliver messages back and forth thanks to aphrant neurons and ephrit

Aphrant neurons also

Chapter 3: Afferent & Efferent Neurons

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known as sensory neurons send signals

from the sensory receptors to the central nervous system. While on the other hand, ephrit neurons also known as

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motor neurons send signals from the central nervous system to the peripheral nervous system. These neurons are really easy to mix up. So just remember aphrant

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neurons send signals to the brain and

spinal cord while ephrant neurons send messages from the brain and spinal cord.

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If you need help remembering this, try to remember that aphrant approaches the brain and ephrant exits the brain. A for

2:12 approach and E for exit. When signals are sent from the brain, the PNS is what relays

parts, allowing them to perform their specific functions. For instance, let's say you decide to move your hand and click that subscribe button down below.

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Your brain is what sends the signal

through the spinal cord to the PNS,

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which then carries the signal to the muscles in your hand, causing them to contract and produce movement, resulting in you joining an amazing online community of psychology learners. Yeah,

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welcome to the community.

2:47 Woohoo! You did it. All right. All right, let's go back to the video. Now,

2:52 we can break the peripheral nervous system down into the somatic nervous system and the autonomic nervous system.

Chapter 5: Somatic Nervous System

2:58 The somatic nervous system, also known as the skeletal nervous system, includes your skeletal muscle n

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d your

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five senses. These movements happen

consciously and are also voluntary.

3:11 Whenever you go biking or play video games, you're using your sematic nervous system. You consciously push the pedals

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with your legs or press the buttons with your controller. All of which involves your brain sending signals to your muscles to move. On the other hand, the

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) autonomic nervous system controls involuntary activities. This system makes sure you keep breathing, keeps your heart beating, your stomach

Chapter 6: Autonomic Nervous System

3:34 digesting, and all those other wonderful bodily functions that happen in the background that you need to survive. The

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autonomic nervous system also allows us to reach homeostasis. It provides stability for our internal envir

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Now, the autonomic nervous system does

have two divisions which work together,

Chapter 7: Sympathetic & Parasympathetic

Division

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especially in an emergency. The first is the sympathetic division, which is sometimes referred to as your fightor-flight response. The sympathetic

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division is what gets your body mobilized

and ready for action. This makes your heart beat faster, your eyes dilate, and increases your breathing. It

4:09 also slows down your digestion to allow for more of your energy to go where it is needed. The second division is the parasympathetic division, which is

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sometimes referred to as rest and digest.

The parasympathetic division is what slows your heart rate, increases

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your digest

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you focus on

saving and storing energy.