It is made up of glands that secrete chemicals called hormones directly into the blood stream. When focusing on a close object, the ciliary muscles contract and the suspensory ligaments relax which means the lens becomes rounder and thicker. What is a plant response to light called? I was just wondering which GCSE subjects i should pursue for the job of maxillofacial surgeon, (I would prefer to become... Sign in with Success at School to save your favourite jobs, careers advice and courses, build your CV, record your work experience and talk to employers and unis in our forums. They contain carbon, hydrogen and oxygen. The guard cells next to the stomata close them if the plant is losing water quicker than it is being replaced. How many pairs of chromosomes does a human cell have? Mostly, the memory loss improves in a few weeks and it is rarely permanent. Glucose + oxygen --> carbon dioxide + water, Respiration without oxygen. Stimulus --> receptor --> sensory neurone --> CNS --> motor neurone --> effector --> response. 3. The embryo could be made to have the same genetic information as the patient, meaning the stem cells produced wouldn't be rejected by the patient's body as the genes are the same. The coronary artery takes glucose and oxygen to muscles. They would die in normal sea water as they swell up and burst. How does the destruction of peat bogs contribute to the carbon dioxide levels in the atmosphere? The female Anopheles needs two meals of human blood before she can lay her eggs, this is when. What is the word equation for photosynthesis? What is a risk of using stem cells in medicine? How did Alexander Fleming discover penicillin? Advice  >  Study In bright light, circular muscles in the iris contract, the radial muscles relax and the pupil constricts. Everyone does their best in subjects they enjoy. They perform three main roles: Why may people need dialysis/kidney transplants? This means the patient has to take drugs to thin their blood, which is a problem if they have an accident, Give the three ways heart valves can be damaged or weakened. The cytoplasm divides and two daughter cells are produced. What does the thyroid gland do and where is it? Click on the links below to go to the relevant past papers, they are free to download. This is the harder stuff, designed to stretch the more able, but there isn't a gigantic difference in terms of difficulty between the two bits. The tumour stays in one place and doesn't invade other tissues in the body. A communicable disease is infectious and caused by pathogens, that can be passed from one organism to another. How is bacteria engineered to produce human insulin? Glucose is used in cellular respiration to provide the energy needed for metabolic reactions within your cells. Control temperature to reduce the transfer of energy from livestock to he environment. What two features do bacteria cells NOT have?   >  Should I take Triple Science GCSE? The cell walls between the cells break down and form sieve plates which allow water and dissolved food to move as needed. Which tissues is the stomach made from and what do they do? Where are proteases made and what do they do? The patient will stop taking insulin, but they will have to take immuno-suppressants instead. How are the alveoli specialised to maximise the rate of diffusion of oxygen and carbon dioxide? These enzymes are the pancreatic juices. What happens to the eye when focusing on a distant object? ADH produced by the pituitary gland is in a negative feedback system to control the amount of water in the blood. Bacterial and viral pathogens make you ill and cause disease by rapidly splitting in two (binary fission) and producing toxins that affect your body. As you chew your food it gets broken down into smaller chunks so it has an increased surface area which allows quicker digestion. The Revision Cycle. Contain chloroplasts, which contain chlorophyll for photosynthesis, Carry water and mineral ions from the roots to the highest leaves and shoots, Xylem cells are alive when they are first formed, but die and form hollow tubes for the water and mineral ions to pass through, Carry food around the plant (translocation). But if you choose to do double science GCSE and an extra GCSE subject you might end up with an even heavier workload. In what types of cell is a cell wall found? Which artery is the only exception to the rule that arteries carry oxygenated blood? State the four parts of the nervous system. What do implants, injections and skin patches do? The 4 types of pathogen are bacteria, viruses, fungi, and protists. When a seed germinates, auxin is equally spread through the tissues. What is the red pigment in red blood cells called? How do you calculate the rate of a reaction? As well as producing mucus to trap pathogens, the nose has hairs to help filter out pollutants from the air. Some people can be fitted with mechanical valves made of titanium or polymers. Biology and chemistry can lead to jobs which are just as diverse. The stability (you must be able to use the medicine under normal conditions and store it safely for a period of time) and whether it is successful and safely removed from the body. Carbohydrates provide us with the fuel that makes all of the other reactions for life possible. This dialysis fluid also contains normal plasma levels of mineral ions so excess ions are removed from the blood. Contract and relax to move the bones of the skeleton. What will happen if kidney problems are left untreated? What happens if a body temperature is too high? They are manually loaded up with waste. Memory loss - this is mostly temporary and patients usually forget the events leading up to the treatment, however some people forget past events.