In bone, 

1,25-dihydroxycholecalciferol acts synergistically with PTH to stimulate osteoclast activity and bone resorption.

TLS Online TPP Program

#Id: 5410

#Unit 7. System Physiology – Animal

Microglia 

arise from macrophages outside of the nervous system are scavenger cells that resemble tissue macrophages and remove debris resulting from injury, infection, and disease.

TLS Online TPP Program

#Id: 3977

#Unit 2. Cellular Organization

The degree of supercoiling of bacterial DNA is maintained by regulation of the net activity of topoisomerases, I and II.

TLS Online TPP Program

#Id: 1230

#Unit 7. System Physiology – Animal

PTH stimulates renal 1α-hydroxylase.

TLS Online TPP Program

#Id: 4501

#Unit 13. Methods in Biology

In augmented unipolar limb lead, two of the limbs are connected through the negative terminal of the electrocardiograph, and the third limb is connected to the positive terminal.

TLS Online TPP Program

#Id: 8793

#Unit 10. Ecological Principles