Quiz On The Nervous System

The central nervous system consists of the brain and spinal cord. These two organs work together to control and coordinate the activities of the body. The brain is responsible for processing information, making decisions, and sending signals to different parts of the body. The spinal cord acts as a communication pathway between the brain and the rest of the body, transmitting signals to and from the brain. Together, the brain and spinal cord form the central command center of the nervous system, playing a crucial role in regulating bodily functions and facilitating communication between different parts of the body.

A nerve cell, also known as a neuron, consists of several components including the cell body, dendrites, and an axon. The root is not a part of a nerve cell. The root is typically associated with plants and is responsible for anchoring the plant and absorbing water and nutrients from the soil. In the context of nerve cells, the root is not relevant and does not play a role in the structure or function of a neuron.

The correct answer is "All of these" because the nervous system is made up of the brain, spinal cord, and nerves. The brain is the control center of the nervous system, while the spinal cord acts as a pathway for nerve signals between the brain and the rest of the body. Nerves are the communication lines that transmit signals to and from the brain and spinal cord to different parts of the body. Therefore, all three components are essential for the functioning of the nervous system.

The explanation for the given correct answer is that the peripheral nervous system consists of all the nerves outside of the central nervous system, which includes the nerves that connect the brain and spinal cord to the rest of the body. This system is responsible for transmitting information between the central nervous system and the rest of the body, allowing for the control and coordination of bodily functions. Therefore, it is true that the peripheral nervous system has all of the nerves outside of the central nervous system.

The nervous system is responsible for transmitting signals throughout the body and coordinating bodily functions. However, it does not have the ability to store water. This function is primarily carried out by the kidneys and the urinary system. Therefore, the correct answer is that the nervous system does not store water.

Synapses are composed of both a presynaptic terminal and a postsynaptic terminal. The presynaptic terminal is where neurotransmitters are released from the neuron, while the postsynaptic terminal is where these neurotransmitters are received by another neuron or cell. This structure allows for the transmission of impulses between neurons or from neurons to other cells, facilitating communication within the nervous system.

The myelin sheath is made of Schwann cells. Schwann cells are a type of glial cell that wrap around and insulate axons in the peripheral nervous system. They form a protective covering called the myelin sheath, which helps to speed up the transmission of electrical impulses along the axon. This insulation allows for faster and more efficient communication between neurons.

The cerebellum is located in the back of the head. It is a small, cauliflower-shaped structure that is positioned at the base of the brain, just above the brainstem. It plays a crucial role in coordinating voluntary movements, maintaining balance, and fine-tuning motor skills. Its location in the back of the head allows it to receive sensory information from the spinal cord and other parts of the brain, and then send out motor signals to control movement and posture.

The statement that there are 41 pairs of spinal nerves that affect sensory, motor, and mixed nerves is false. In reality, there are 31 pairs of spinal nerves that are responsible for transmitting sensory, motor, and mixed signals throughout the body. These nerves emerge from the spinal cord and are crucial for the functioning of the peripheral nervous system.

The statement is false because the spinal nerves located in the chest area are actually called Thoracic nerves, not Lumbar nerves. The thoracic nerves are responsible for transmitting sensory and motor information between the chest and the spinal cord. The lumbar nerves, on the other hand, are located in the lower back region and are responsible for transmitting signals to and from the lower limbs.

Studying the nervous system helps therapists understand the effects stress has on our body. The nervous system plays a crucial role in regulating our body's response to stress. It controls the release of stress hormones, such as cortisol, and activates the fight-or-flight response. By studying the nervous system, therapists can gain insights into how stress impacts various bodily functions, such as heart rate, blood pressure, and immune response. This understanding allows them to develop effective strategies and interventions to help individuals manage and cope with stress-related issues.

The cerebrum is the largest part of the brain and is responsible for higher functions such as thinking, reasoning, memory, and sensory processing. It is divided into two hemispheres and plays a crucial role in coordinating various complex activities.

The 12th cranial nerve, also known as the hypoglossal nerve, is not pure sensory. It is actually a mixed nerve, meaning it contains both sensory and motor fibers. The hypoglossal nerve primarily innervates the muscles responsible for controlling the movements of the tongue. Therefore, the statement that the 12th cranial nerve is pure sensory is incorrect.

The answer is "They are projections from nerve soma." Dendrites are part of a nerve cell (or neuron) and serve as the part that receives signals from other cells. They are projections or branches that extend from the main body of the neuron, called the soma or cell body. These dendrites have small protrusions called dendritic spines, which help to increase their surface area and allow them to receive more signals from other neurons. The signals received by the dendrites are then transmitted through the neuron, ultimately leading to the generation of a new signal or response. Dendrites play a crucial role in the communication between neurons and are essential for the proper functioning of the nervous system.