Objective 3 - Neurons & Reflex Arcs - Quiz, Flashcards & Trivia

1. Identify the part of the neuron shown here:

Axon

Axon terminal

Dendrite

Soma

The correct answer is axon. The axon is a long, slender projection of a neuron that carries nerve impulses away from the cell body. It is responsible for transmitting electrical signals to other neurons, muscles, or glands. The axon terminals are located at the end of the axon and are involved in transmitting the signals to the next neuron or target cell. Dendrites, on the other hand, receive signals from other neurons and transmit them to the cell body. The soma, also known as the cell body, contains the nucleus and other organelles of the neuron.

Explanation

The correct answer is axon. The axon is a long, slender projection of a neuron that carries nerve impulses away from the cell body. It is responsible for transmitting electrical signals to other neurons, muscles, or glands. The axon terminals are located at the end of the axon and are involved in transmitting the signals to the next neuron or target cell. Dendrites, on the other hand, receive signals from other neurons and transmit them to the cell body. The soma, also known as the cell body, contains the nucleus and other organelles of the neuron.

2. What type of neuron sends information TO the brain?

Motor neuron

Interneuron

Sensory neuron

None of the above

Sensory neurons are responsible for sending information from sensory receptors in the body to the brain. These neurons detect various stimuli such as touch, temperature, pain, and transmit signals to the brain, allowing us to perceive and interpret our surroundings. Motor neurons, on the other hand, transmit signals from the brain to muscles and glands, while interneurons facilitate communication between different neurons within the central nervous system. Therefore, the correct answer is sensory neuron.

Explanation

Sensory neurons are responsible for sending information from sensory receptors in the body to the brain. These neurons detect various stimuli such as touch, temperature, pain, and transmit signals to the brain, allowing us to perceive and interpret our surroundings. Motor neurons, on the other hand, transmit signals from the brain to muscles and glands, while interneurons facilitate communication between different neurons within the central nervous system. Therefore, the correct answer is sensory neuron.

3. The ________________ of the neuron receives neurotransmitters, then sends an electrical signal down the ________.

Axon; axon terminal

Dendrites; axon

Dendrites; soma

Axon; dendrites

Dendrites are the branch-like extensions of a neuron that receive neurotransmitters, which are chemical messengers, from other neurons. These neurotransmitters bind to receptors on the dendrites and initiate an electrical signal. This electrical signal then travels down the axon, a long fiber-like structure of the neuron, to the axon terminal where it is transmitted to the next neuron or target cell. Therefore, the correct answer is dendrites; axon.

Explanation

Dendrites are the branch-like extensions of a neuron that receive neurotransmitters, which are chemical messengers, from other neurons. These neurotransmitters bind to receptors on the dendrites and initiate an electrical signal. This electrical signal then travels down the axon, a long fiber-like structure of the neuron, to the axon terminal where it is transmitted to the next neuron or target cell. Therefore, the correct answer is dendrites; axon.

4. Put the steps of a typical reflex arc in the correct order.

1

2

3

4

5

Submit

5. A person who can move their left leg, but cannot feel anything below the left knee, probably has what type of nerve damage?

Sensory nerve damage

Motor nerve damage

Sensory and motor nerve damage

Interneuron damage

A person who can move their left leg but cannot feel anything below the left knee most likely has sensory nerve damage. Sensory nerves are responsible for transmitting sensations such as touch, temperature, and pain to the brain. In this case, the person's ability to move their leg suggests that the motor nerves, which control muscle movement, are intact. However, the lack of sensation indicates a problem with the sensory nerves, resulting in the inability to feel anything below the left knee.

Explanation

A person who can move their left leg but cannot feel anything below the left knee most likely has sensory nerve damage. Sensory nerves are responsible for transmitting sensations such as touch, temperature, and pain to the brain. In this case, the person's ability to move their leg suggests that the motor nerves, which control muscle movement, are intact. However, the lack of sensation indicates a problem with the sensory nerves, resulting in the inability to feel anything below the left knee.