Control and coordination in animals
Quick practice
Question 1 of 5
A student accidentally touches a hot iron rod and immediately withdraws his hand. Even before he becomes fully aware of the pain, the withdrawal has already occurred. Which of the following correctly explains this response?
Thermoreceptors directly stimulate the brain, which sends motor impulses to hand muscles.
Interneurons in the brain detect heat and directly activate muscles without involving the spinal cord.
Receptors in the skin convert the stimulus into electrical impulses that are transmitted through sensory neurons to the spinal cord for immediate response.
Motor neurons first detect the heat stimulus and then transmit impulses to the spinal cord.
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