Answer: 1. False 2. True 3. False 4. False
Step-by-step explanation:
1. False. The greatest density of touch receptors is found in the fingers, lips, and tongue, rather than the arms and legs.
2. True. Touch is detected by specialized sensory receptors called mechanoreceptors, which are sensitive to mechanical pressure or deformation.
3. False. Thermoreceptors which respond to heat and cold are found in the skin and subcutaneous tissues of the body, not in the thalamus region of the brain. The thalamus does play a role in processing temperature information, but it receives signals from peripheral thermoreceptors in the body.
4. False. The brain does not have pain receptors that respond to chemicals released during infection. Pain receptors, also known as nociceptors, are found in the skin, muscles, joints, and other tissues throughout the body. When these receptors are activated by tissue damage, inflammation, or other stimuli, they send signals to the brain via specialized nerve fibers called nociceptive fibers.