LO.3.02 - Spinal Cord and Spinal Reflex

Which part of the neuron is responsible for receiving information?

• Axon

• Cell Body

• Dendrites

• Myelin Sheath

• Terminal Button

Answer explanation

Dendrites are the parts of the neuron that receive information from other neurons. They act as the input channels, collecting signals and transmitting them to the cell body for processing.

The reflex arc that does not involve the brain is known as?

• Monosynaptic Reflex

• Spinal Reflex

• Polysynaptic Reflex

• Conscious Reflex

• Somatic Reflex

Answer explanation

The spinal reflex is a neural pathway that bypasses the brain, allowing for quick responses to stimuli. It involves sensory neurons and motor neurons in the spinal cord, making 'Spinal Reflex' the correct answer.

True or False: The role of the spinal cord includes relaying motor commands to muscles.

• True

• False

Answer explanation

True. The spinal cord is responsible for relaying motor commands from the brain to the muscles, enabling movement and coordination.

What is the primary function of the myelin sheath?

• Protects the axon

• Speeds up electrical transmission

• Insulates neurons

• Produces neurotransmitters

• All of the above

Answer explanation

The myelin sheath primarily protects the axon, speeds up electrical transmission, and insulates neurons, making 'All of the above' the correct choice.

Name two types of spinal reflex arcs.

Answer explanation

Two types of spinal reflex arcs are the monosynaptic reflex arc, which involves one synapse between a sensory and a motor neuron, and the polysynaptic reflex arc, which involves one or more interneurons between the sensory and motor neurons.

Which neuron is responsible for carrying sensory information to the CNS?

• Motor Neuron

• Interneuron

• Sensory Neuron

• Schwann Cell

• Myelin Sheath

Answer explanation

The sensory neuron is responsible for transmitting sensory information from the body to the central nervous system (CNS), making it the correct choice. Motor neurons carry signals away from the CNS, while interneurons connect neurons.

Which part of the neuron transmits information across the synapse to another neuron?

• Axon

• Schwann Cell

• Axon Terminal

• Nodes of Ranvier

• Soma

Answer explanation

The axon terminal is the part of the neuron that releases neurotransmitters into the synapse, allowing communication with another neuron. It is essential for transmitting information across the synaptic gap.

What is the role of interneurons in the CNS?

• Carry motor messages

• Insulate neurons

• Connect sensory and motor neurons

• Produce neurotransmitters

• Facilitate reflexes

Answer explanation

Interneurons play a crucial role in the CNS by connecting sensory and motor neurons, facilitating communication between them. This connection is essential for processing information and coordinating responses.

True or False: The monosynaptic reflex arc involves only one synapse.

• True

• False

Answer explanation

True. A monosynaptic reflex arc consists of only one synapse between the sensory neuron and the motor neuron, allowing for a quick response without involving interneurons.

Which neuron transmits information from the CNS to muscles?

• Sensory Neuron

• Motor Neuron

• Schwann Cell

• Interneuron

• Myelin Sheath

Answer explanation

The motor neuron is responsible for transmitting information from the central nervous system (CNS) to muscles, enabling movement. In contrast, sensory neurons carry signals to the CNS, while interneurons connect neurons within the CNS.