Health: Stretches that do not involve motionand are held for a brief period of time are called: A. Isometric stretches B. Static stretches C. Isotonic stretches D. PNF stretches

Isometric stretching

Explanation:

Isometric stretching is a type of static stretching (meaning it does not use motion) which involves the resistance of muscle groups through isometric contractions (tensing) of the stretched muscles

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.

the answer is

c. parental