Homeostasis

• Your reaction time is how long it takes you to respond to a stimulus.
• The eye is a sense organ containing receptors sensitive to light intensity and colour, with many different structures within it.
• The process of accommodation involves changing the shape of the lens to focus on near or distant objects, with the ciliary muscles contracting to make the lens thicker and more curved when focusing on a near object, and relaxing to make the lens thinner when focusing on a distant object.
• The thermoregulatory centre which monitors and controls body temperature is found in the brain, with receptors that monitor the temperature of the blood and receptors in the skin that send impulses to the thermoregulatory centre.
• The sclera is a white outer layer which supports the structures inside the eye, and is strong to prevent some damage to the eye.
• The mixed pill contains oestrogen and progesterone, inhibiting FSH so no eggs mature and causing the lining to stop developing, making it thick so sperm cannot move through.
• In Vitro Fertilisation (IVF) is a treatment where the mother is given FSH and LH to encourage the maturation of eggs, these are extracted from the mother and fertilised in the lab using sperm, and the fertilised eggs develop into embryos and then one or two are inserted in the uterus.
• Anti-diuretic hormone (ADH) is a hormone involved in the control of the loss of water as urine and it is released into the pancreas by the pituitary gland when a receptor in the brain detects that the blood is too concentrated.
• Insulin binds to cell in target organs (muscles and liver) causing glucose to move from the blood into muscle cells for respiration and excess glucose to be converted into glycogen which is stored in the liver.
• The pancreas secretes insulin which controls blood glucose levels.