Question

Which of the following is true in regard to cell types and the matrix of bone?

Hydroxyapatite gives bone its flexibility whereas collagen gives bone its hardness

Osteocytes are osteoblasts trapped in the matrix they formed

Osteoclasts synthesise the organic matter of the matrix of bone

Osteoblasts have a similar origin to blood cells

Which of the following is true in regard to how the CNS encodes sensory receptor information?

There is a topographical represention of sensation on the precentral gyrus.

Pain receptors are phasic, giving a quick burst of activity followed by a reduced firing rate.

The CNS will sense strong stimuli if high threshold receptors are activated.

Larger areas of the cortex will correspond with larger receptive fields for a sensory receptor

Answer 1

1. Option 2nd is the correct answer.

Osteoblast cells are responsible for bone formation. Osteoblast cells produce matrix around it and get trapped upon hardening of the matrix. After trapping the structure and function of these osteoblast are changed and becomes osteocytes. Osteocytes maintain the bone strength and health of bone matrix by sending signals for bone formation and bone resorption.

2. Option 1st is the correct answer.

In many parts of the mammalian brain spatially adjacent stimuli on sensory receptor surfaces are represented in adjacent positions in cortex, a pattern known as topographic organization.