ks3 recap Flashcards
what is the basic unit that all living things are made of?
cells
what are sperm and eggs
cells
what does sperm use to swim towards an egg?
tail
Name the reproductive organ where sperm are made
testicles
In reproduction a sperm fuses with an egg. What is this process called?
Fertilisation
Carbon Monoxide, nicotine and tar all get into the lungs when a person smokes. Name one harmful effect on the body of each of the substnaces
Carbon monoxide - lack of oxygen in cells , heart disease , heart attacks
Nicotine - increase in blood pressure, increase in heart rate, flow of blood to the heart, hardening of arterial walls- heart attack
Tar- damages lungs(could lead to lung cancer)
what is the process by which plants produce glucose and oxygen?
photosynthesis
what is the process called by which the human body releases energy from glucose and oxygen
reapiration
name the two types of respiration
anaerobic & aerobic
give two functions of the human skeleton
gives the body its shape, makes blood cells, provides protection for organs
what is a parasite?
an organism that lives in or on a host organism and gets its food from the expense of the organism
which gas lasses into the blood from the air in the lungs
oxygen
which gas passes out of the blood into the air in the lungs
carbon dioxide (Co2)
the walls of the capillaries and the aveoli are very thin, why?
so that the gases can quickly difuse through it
