Core Science B1
- Created by: ameyjadexo
- Created on: 01-05-16 16:13
View mindmap
- Biology 1
- Homeostasis and Plant Hormones
- Homeostasis is maintaining a constant internal environment of the body.
- Keeps levels of temperature, water and carbon dioxide steady.
- Temperature control.
- vasoconstriction is the narrowing of blood vessels in the skin. It causes less flood flow and less heat transfer.
- Vasodilation is the widening of small blood vessels in the skin. It causes more blood flow near the skin and results in in more heat transfer
- Auxins are a group of plant hormones. they cause shoot curvature by cell elongation.
- Auxins are involved in Phototropism and Geotropism.
- Plant hormones are used as weed killers to increase crop yield and as rooting powder to increase root growth.
- Homeostasis is maintaining a constant internal environment of the body.
- Drugs and Disease
- People can be immunised against a pathogen through vaccination. Different vaccines are needed for different pathogens.
- 1. inject a harmless pathogen carrying antigens.
- 2. the antigens trigger a response by white blood cells, producing the correct antibodies
- 3. memory cells remain in the body, providing immunity to that disease.
- 2. the antigens trigger a response by white blood cells, producing the correct antibodies
- 1. inject a harmless pathogen carrying antigens.
- Harmful drugs are classified as Class A,B and C.
- Depressants block the transmission of nerve impulses across synapses
- Stimulants speed up nerve impulses.
- People can be immunised against a pathogen through vaccination. Different vaccines are needed for different pathogens.
- The Nervous System
- Neurons are adapted by being long, having branched endings to pick up impulses and having an insulator sheath.
- The gap between neurons is called a synapse.
- Light rays are refracted as they pass through the cornea and lens.
- The eye adapts by altering the shape of the lens.
- Monocular vision has a wide field of view but is poorer at judging distance than binocular vision.
- The eye adapts by altering the shape of the lens.
- Diet and Exercise
- Being fit is the ability to do exercise. Being healthy is being free from disease.
- Blood pressure has two readings, Diastolic and Systolic.
- It can be increase by alcohol smoking and being overweight.
- It can be reduced by regular exercise and healthy eating.
- High blood pressure can cause strokes
- Low blood pressure and cause poor circulation and fainting.
- You need to eat a balanced diet that has the right amounts of chemicals found in food. Three of these are, Carbohydrates, proteins and fats
- Carbohydrates are stored in the liver as glycogen.
- Fats are stored under the skin and around organs.
- Proteins are made of amino acids.
- Too little Protein causes kwashiorkor.
- EAR=0.6x Body mass in kg
- Daily protein intake
- BMI= mass in kg / (Height in m)^2
- 30+ is overweight
- 25-30 is obese
- 20-25 is normal
- less than 20 is underweight
- Variation and Inheritance
- Alleles are different versions of the same gene.
- Dominant alleles are expressed if present, recessive alleles are expresses in the absence of dominant alleles.
- Most faulty alleles are recessive.
- Inherited disorders are caused by faulty alleles.
- The human body has 23 pairs of chromosomes
- Gender is determined by sex chromosomes ** in female XY in male.
- Being Homozygous is having two identical alleles.
- Genetic Variation is caused by mutations.
- Alleles are different versions of the same gene.
- Homeostasis and Plant Hormones
Comments
No comments have yet been made