Class 10 - NCERT Book - only references from this book, answers from the internet will be reported. No spam!!!​

The force that blood exerts against the wall of a vessel is called blood pressure.

Class 10 - NCERT Book - definition.

the core of the sun is so hot and there is so much pressure, nuclear fusion takes place, hydrogen is changed to helium. nuclear fusion creates heat and photons. when the heat reaches the earth it warms the molecules of the atmosphere, and they warm other molecules and so on.

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.