Review the chart, which shows the population sizes of three African animals in 1990 and in 2000.

Population Estimates of Animals in Africa in 1990 and in 2000

1990
2000
Lions
100,000
47,000
Cheetahs
50,000
7,500
Zebras
15,000
2,500

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.