Page 24 - SAAT BIOLOGY PART 2

SAAT BIOLOGY MR.MOHAMED ELGAYAR MRPROF.NET
calcium and phosphorous for strengthening the

bones, and iron to make hemoglobin.

Compounds used by the body as building materials, for

example

Calcium and phosphorous for strengthening the bones,

and iron to make hemoglobin.

▪ Endocrine System:

Hormone: a chemical substance that acts on certain target

cells and tissues to produce a specific response.

Types of hormones:

Steroid hormones: are soluble in lipids and therefore can

diffuse through the plasma membrane of a target cell.

Amino acid hormones: must bind to receptors found on the

plasma membrane of a target cell because they cannot

diffuse through the Plasma membrane.

MRPROF.NET MR.MOHAMED ELGAYAR MRPROF.NET@GMAIL.COM