term 4 yr 8 Flashcards
What does the circulatory system do
Responsible for transporting oxygen nutrients to your body’s cells
Keeps wastes away from nutrients (carbon dioxide)
Arteries
Tubes with thick elastic muscular walls that carry blood under high pressure away from your heart
Veins
Tubes with thin Wallsend possess valves that prevent the blood from flowing backwards
Capillaries
Transport substance such as oxygen and nutrient to cells and remove wastes such as carbon dioxide
Red blood cells
Contain a protein called hemoglobin, which carries oxygen from the lungs to all parts of the body
White blood cells
Referred to as ‘soldiers’ in the blood as they are involved in fighting diseases
Platelets
In the blood to help it to colt and plug damaged blood vessels
This seal prevents germs getting in
Deoxygenated blood
Used blood, stripped from oxygen
pumps to lungs to become oxygenated
Oxygenated blood
Pumped out through arteries to your body tissues
Delivers oxygen and nutrients
Role of the Respiratory system
To get oxygen in and carbon dioxide out
Passage of oxygen
Air –> Nose/Mouth –> Pharynx –> Larynx –> Trachea –> Left or Right Bronchi –> Bronchioles –> Alveoli
Claudius Galen
Human heart 2 chambers
Source of the body’s heat
Blood made by liver
Andreas Vesalius
Necessary to direct bodies to find out how they work.
Discovered anatomical structures previously unknown
William Harvey
Assisted in revising the structure of the human heart
Diaphragm
Tightens when you breath in. Lungs expand, air is pulled into them
Relaxes when you breath out and lung size reduces to push air out
Asthma triggers
- Vigorous exercise
- Cold weather
- Cigarette smoke
- Dust and dust mines
- Moulds
- Pollen
- Air pollution
- Some foods and food additives
- Some animals
Asthma symptoms
- Difficulty breathing
- wheezing
- coughing
- tight feeling in the chest
Asthma
Preventer:
Make linings of airways less sensitive
Relievers:
Open up airways once an attack has started
Role of digestive system
Brakes down food so that nutrients it contains can be absorbed into your blood and carried to each cell in your body
Mechanical digestion
Physically breaking down food e.g. using teeth
Chemical digestion
Using chemicals called enzymes to break down food into smaller molecules
Enzymes
Increase the rate of the chemical reactions in Chemical digestion
Problems in excretory system
Kidney diseases make it so that people are not able to remove waste materials from their blood effectively.
