5.2 The human nervous system

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Question 5
Easy
a.

The Reflex Arc

A student accidentally touches a hot beaker. The heat is detected by a temperature receptor in the skin, initiating a rapid reflex action.

Complete the sequence of neurones that transmit electrical impulses in this reflex arc. Choose your answers from the list below:

  • motor neurone
  • relay neurone
  • sensory neurone
receptor→_______________→_______________→_______________→effector \text{receptor} \rightarrow \text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_} \rightarrow \text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_} \rightarrow \text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_} \rightarrow \text{effector} receptor→_______________→_______________→_______________→effector
[3]
b.

Reflex Characteristics

Identify two key characteristics of a reflex action that distinguish it from a voluntary action.

[2]
c.

Brain Anatomy and Function

Diagram of a sagittal section of the human brain with labels A, B, C, and D pointing to different structures.

  1. Which letter represents the cerebellum, which coordinates motor control, balance, and posture?
  2. What is the main function of the region labeled D (the hypothalamus)? Select one of the following:
    • Controlling cardiac and respiratory automatic processes
    • Regulating body temperature, hunger, and water balance (homeostasis)
    • Conscious processes such as intelligence, memory, and language
[2]

5.2 The human nervous system Questions

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