Right now, you are sitting perfectly still. Despite the lack of movement, there

Question

Right now, you are sitting perfectly still. Despite the lack of movement, there are structures that are involved in the maintenance of your posture. Which of the following structure-function pairs is incorrect or not involved in the current maintenance of your posture?

A. Nociceptors - informing the brain of the current temperature in the room

B. Proprioreceptors - inform brain of body position

C. Joints - allow bones to move if changing position or prevent bone-bone grinding

D. Spinal muscles - slight contractions to keep body elevated

A. Nociceptors - informing the brain of the current temperature in the room

B. Proprioreceptors - inform brain of body position

C. Joints - allow bones to move if changing position or prevent bone-bone grinding

D. Spinal muscles - slight contractions to keep body elevated

Explanation / Answer

Nociceptors respond to heat or cold, excess pressure or mechanical deformation and also tested chemicals. They are sleeping when someone do not respond at all to chemical, thermal or mechanical stimuli unless injury has occurred.

Proprioreceptors are sensors that provide information about joint angle, muscle length and muscle tension that is integrated to give information about the position of the limb in space.

Joint's function is to bear weight, perform work and exhibit a particular range of motion during movement.

Spinal muscles supports spine, hold it upright and control movement during rest and activity.

Therefore, in sitting position when no movement at all, joint can not perform any function or not involved in the current maintenance of the posture. So, (C) is the right answer.

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