Chemical Regulating Systems Hormones: cell to cell communication molecules Made in gland(s) or cells Transported by blood Distant target tissue.
Most molecules must pass through proteins functioning as selective gates –Termed transport systems Proteins may be called permeases, carriers –Membrane-spanning.
Chapter 7a Introduction to the Endocrine System. Endocrinology Study of hormones Specialized chemical messengers Secreted by select cells Action at distant.
Chapter 7a
