Be able to evaluate the practical risks and benefits, as well as social and ethical issues, of the use of stem cells in medical research and treatments. Be able to explain the effect of lifestyle factors including diet, alcohol and smoking on the incidence of non-communicable diseases at local, national and global levels. Benign tumours and malignant tumours result from uncontrolled cell division. You should have observed and drawn plant and animal cell sections as seen under a microscope. The alkaline conditions and large surface area increase the rate of fat breakdown by lipase.
Be able to calculate the number of bacteria in a population after a certain time if given the mean division time Buy now Higher Human Biology Past Papers Online
In double blind trials, some patients are given a placebo, which does not contain the drug. Once inside the body our immune system is triggered which is usually strong enough to destroy the pathogen and prevent disease. You should be able to describe the process of discovery and development of potential new medicines, including preclinical and clinical testing. Faulty heart valves can be replaced using biological or mechanical valves. They depend on their host to provide the conditions and nutrients that they need to grow and reproduce.
Root hair cells are adapted for the efficient uptake of water by osmosis and mineral ions by active transport. You should be able to develop an understanding of size and scale in relation to cells, tissues, organs and systems Higher Human Biology Past Papers Online Buy now
Immune reactions initially caused by a pathogen can trigger allergies such as skin rashes and asthma. Most new drugs are synthesised by chemists in the pharmaceutical industry. Knowledge of the blood vessels associated with the heart is limited to the aorta, vena cava, pulmonary artery, pulmonary vein and coronary arteries. Be able to use data to relate limiting factors to the cost effectiveness of adding heat, light or carbon dioxide to greenhouses. If it is reproduced, sqa must be clearly acknowledged as the source.
However, the starting point may still be a chemical extracted from a plant. You are not expected to recall any specific tests or treatments but given appropriate information you should be able to explain how they work Buy Higher Human Biology Past Papers Online at a discount
Diffusion is the spreading of the particles of any substance in solution, or particles of a gas, resulting in a net movement from an area of higher concentration to an area of lower concentration. New medical drugs have to be tested and trialled before being used to check that they are safe and effective. In mitosis one set of chromosomes is pulled to each end of the cell and the nucleus divides. You should be able to describe some of the ways in which monoclonal antibodies can be used. Respiration - aerobic and anaerobic in plants, fungi and animals, conditions, substrates etc.
They are produced by stimulating mouse lymphocytes to make a particular antibody. Know that during exercise the human body reacts to the increased demand for energy Buy Online Higher Human Biology Past Papers Online
Pathogens are microorganisms such as viruses and bacteria that cause infectious diseases in animals and plants. You should be able to describe how to prepare an uncontaminated culture using aseptic technique petri dishes and culture media must be sterilised before use to kill unwanted microorganisms inoculating loops used to transfer microorganisms to the media must be sterilised by passing them through a flame the lid of the petri dish should be secured with adhesive tape to prevent microorganisms from the air contaminating the culture, and stored upside down to stop condensation drops falling onto the agar surface. You should have used qualitative reagents to identify biological molecules such as starch, sugars and proteins (know the chemical tests for them) Buy Higher Human Biology Past Papers Online Online at a discount
This section explores how we can avoid diseases by reducing contact with them, as well as how the body uses barriers against pathogens. In coronary heart disease (an example of cardiovascular disease) layers of fatty material build up inside the coronary arteries, narrowing them. Benign tumours are growths of abnormal cells which are contained in one area, usually within a membrane. They are produced by stimulating mouse lymphocytes to make a particular antibody. It is caused by a bacterium and was easily treated with the antibiotic penicillin until many resistant strains appeared.
The left ventricle pumps blood around the rest of the body. This phenomenon has led to the development of stem cell technology Higher Human Biology Past Papers Online For Sale
The two essential reactions for life on earth photosynthesis and respiration from sections photosynthetic reaction and aerobic and anaerobic respiration. It gives a distinctive mosaic pattern of discolouration on the leaves which affects the growth of the plant due to lack of photosynthesis. The stomach produces acid which kills the majority of pathogens which enter via the mouth. Be able to explain how the spread of diseases can be reduced or prevented. You should be able to calculate and compare surface area to volume ratios.
Inserted stents are used to keep the coronary arteries open. Antibiotics, such as penicillin, are medicines that help to cure bacterial disease by killing infective bacteria inside the body For Sale Higher Human Biology Past Papers Online
You should be able to link the structure of a root hair cell to its function. Although there has been huge progress in surgical techniques, especially with regard to coronary heart disease, many interventions would not be necessary if individuals reduced their risks through improved diet and lifestyle. All copyrights reserved on revision notes, images, quizzes, worksheets etc. In school and college laboratories, cultures should be incubated at a maximum temperature of 25c to reduce the likelihood of the growth of pathogens that might be harmful to humans. You should be able to explain graphs of photosynthesis rate involving two or three factors and decide which is the limiting factor.
This has enabled biologists to see and understand many more sub-cellular structures Sale Higher Human Biology Past Papers Online