steroid hormone signalling

Oestradiol and Progesterone

Hormones produced in the ovaries.

Oestradiol Receptors

Receptors found in the hypothalamus.

Hypothalamus

Brain region controlling the pituitary gland's activity.

FSH and LH

Hormones released by the pituitary gland in response to oestradiol.

Progesterone Effects

Direct impact on the uterus lining.

Negative Feedback

Response that decreases the initial stimulus.

Insulin

Hormone secreted by beta cells in response to high blood sugar levels.

Glucagon

Hormone secreted by alpha cells in response to low blood sugar levels.

Positive Feedback

Response that increases the initial stimulus.

Ethylene

Gas produced by ripe fruit, triggering fruit ripening.

Fruit Ripening

Process where ethylene gas from ripe fruit causes nearby fruit to ripen.