Select the correct statement about feedback regulation in endocrine systems. Select the correct statement about feedback regulation in endocrine systems.

a. All hormones are regulated by negative feedback loops.
b. A hormone cascade pathway involves the hypothalamus, posterior pituitary, and endocrine gland.
c. Some homeostatic control systems rely on pairs of negatively regulated hormone pathways, each counterbalancing the other.

B.

Explanation: Feedback regulation of endocrine system explains the hormone pathway in which neurons in the hypothalamus secreting thyroid releasing hormone, posterior pituitary and endocrine glands

C.

Explanation:

The response pathway for many hormones involves negative feedback, a loop in which response reduces the initial stimulus.

Whereas the positive feedback dampens the response like oxytocin and helps in better release of hormone required.

The negative and positive feedback have different functions. positive feedback reinforces the stimulus and response where as the negative feedback helps in maintaining and stabilizing  the existing affairs of the  state so that no external unwanted substance enters in the system.      

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.