Which of the following other pathways also demonstrate positive feedback?

(A) Glycolysis leads to the production of ATP. ATP, in turn, turns off the enzyme phosphofructokinase, which catalyzes a key phosphorylation step in glycolysis.

(B) The anterior pituitary gland in the brain releases adrenocorticotropic hormone (ACTH). ACTH then causes the adrenal cortex to release glucocorticoids. Glucocorticoids then prevent the pituitary from releasing more ACTH.

(C) Luteinizing hormone triggers ovulation and the formation of the corpus luteum, which is a hormone-producing structure formed during ovulation. The corpus luteum secretes progesterone, which inhibits LH. The drop in LH causes the degradation of the corpus luteum.

(D) When a tissue is injured, it releases chemicals that activate platelets. Activated platelets themselves then release chemicals that activate more platelets. These activated platelets then release chemicals to activate more platelets.

During labor, pressure on the cervix and oxytocin form a positive feedback loop as shown below.

Transcribed Image Text:

Nerve impulses from cervix transmitted to brain Head of baby pushes against cervix 18.4 Oxytocin stimulates uterine contractions and pushes baby toward cervix Brain stimulates pituitary gland to secrete oxytocin Oxytocin carried in bloodstream to uterus