BRAINCAKEOrganism level systems
Revision notes for Organism level systems in OCR Combined Science A (J250). Every lesson in BrainCake comes with R.E.C.I.P.E. recall steps, a quick check and spaced reviews.
- Structure of the nervous systemThe nervous system lets the body detect changes and respond to them.
- How the nervous system coordinates a responseThe nervous system produces a coordinated response because it reaches all parts of the body.
- The reflex arcA reflex action is a rapid, automatic response to a stimulus.
- Hormonal coordination and the endocrine systemThe body has two coordination systems.
- Thyroxine and adrenalineThyroxine is made by the thyroid gland in the neck.
- Hormones in human reproductionAt puberty the reproductive hormones cause the body to change.
- Control of the menstrual cycleThe menstrual cycle lasts about 28 days.
- Hormones and contraceptionContraception lowers the chance of pregnancy.
- Hormones and infertility treatmentA person is infertile if they cannot have a baby naturally.
- Maintaining a constant internal environmentEvery cell in your body carries out metabolic reactions, and each one is controlled by an enzyme.
- How insulin controls blood sugar levelThe amount of glucose in your blood is called the blood sugar level, or blood glucose level.
- How glucagon and insulin work togetherInsulin lowers the blood glucose level, but the level can also fall too low, for example between meals or during exercise when cells use up glucose…
- Type 1 and type 2 diabetesDiabetes is a condition in which the blood glucose level cannot be controlled properly, so it can rise too high.