Coordination and control – the nervous system

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Question 20

Medium

The diagram shows a cross-section of the human spinal cord and the pathway of a spinal reflex arc.

Spinal reflex arc

Which sequence correctly describes the direction of nerve impulse transmission during a reflex action, and correctly identifies the anatomical pathways involved?

$P→Q→R→S→T\text{P} \rightarrow \text{Q} \rightarrow \text{R} \rightarrow \text{S} \rightarrow \text{T}$ , where $Q\text{Q}$ is an afferent neurone entering the spinal cord via the dorsal root and $S\text{S}$ is an efferent neurone exiting via the ventral root.

$P→S→R→Q→T\text{P} \rightarrow \text{S} \rightarrow \text{R} \rightarrow \text{Q} \rightarrow \text{T}$ , where $S\text{S}$ is an afferent neurone entering the spinal cord via the ventral root and $Q\text{Q}$ is an efferent neurone exiting via the dorsal root.

$T→S→R→Q→P\text{T} \rightarrow \text{S} \rightarrow \text{R} \rightarrow \text{Q} \rightarrow \text{P}$ , where $S\text{S}$ is an efferent neurone exiting the spinal cord via the ventral root and $Q\text{Q}$ is an afferent neurone entering via the dorsal root.

$P→Q→R→S→T\text{P} \rightarrow \text{Q} \rightarrow \text{R} \rightarrow \text{S} \rightarrow \text{T}$ , where $Q\text{Q}$ is an efferent neurone entering the spinal cord via the dorsal root and $S\text{S}$ is an afferent neurone exiting via the ventral root.

Coordination and control – the nervous system

Question 20

Coordination and control – the nervous system Questions

Coordination and control – the nervous system

Question 20

Coordination and control – the nervous system Questions