Fitness and Health
Health - How healthy someone is. Eg. Free from disease or infection.
Fitness - How fast you can recover from physical excersize
Blood pressure is measured in Systolic pressure and Diastolic pressure
High B.P= Blood vessels more likely to burst. Increased risk of brain damage. Increased risk of heart disease.
Low B.P= Dizziness. Finting. Poor circulation.
BMI = Body mass index - Weight (kg) divide by height(M) then divide by height again.
Homeostasis - Keeping thngs in the body the same Eg. Temperature at 37
Smoking = Thrombosis - Increases BP and heart rate
= Nicotine - puts strain on the heart
= Carbon Monoxide - Restrics oxygen going to organs causing them to fail
= Tar - Affedcts breathing and thickens blood
= Multiple Chemicals - Leads to furing of the artaries.
Variation and Inheritance
Environmental - Tattoo, Accent , Piercing , Scar ,
Inhereted/Genetic - Natural hair colour, Body Sturcture , Conditions/Disorders , Skin Tone.
Dominant - Dominant gene
Recessive - Weaker genes need double for blue eyes
Men and Women have 46 chromosomes
Genotype - Genetic make up for a trait
Phenotype - Physical feature for that characteristic
Girl = **
Boy = xy
Classification is thw grouping of things according to characteristics.
-Genus Latin name = Genus Species
Energy Flow, Pyramids of number and biomass
Producer - Always a plant.
Makes its own food by photosnthesis
Converts light energy from the sun into chemical energy.
sense organs and the eyes
Sense organs - Smell , Touch, Sight , Taste, Hearing
Short Sighted - Eye ball is too long or has the wrong shaped lens - Can add a concave lens(Myopia)
The image is focused infront of the retina not on it.
Long sighted - eyeball is too short or wrong shaped lens. - Can add a convex lens(Hypermetropia)
Image is focused behind the retina
Red/green colour blindness- some people can not tell the difference between red and green.
Bi-nocular - Two eyes
Monocular - One eye
Tri-nocular - Three eyes
The Nervous System
It is used to detect stimuli
Receptors - Sensors on the body that detect stimuli the information they pick up is passed along nerve fibres to the brain.
Neurons- The nerve fibres are made up of lots of nerve cells called neurons. Information passes along Neurons as electrical signals known as impulses.
A Sensory - Carries impulses from the receptor to the spinal chord.
A Relay- Carries impulses from the spinal chord to the brain and then back along the spinal chord.
Motor - Takes impulses from the spinal chord to the effector (muscle)
Made up of -
The spinal chord
Tropism - Plants detect something and respond to it
Auxin - Plant hormone
Stimulus - Evokes a specific reaction