Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
6 Cards in this Set
- Front
- Back
|
What is the heart? |
A pumping organ made of muscle to keep blood flowing around the body. It has valves to stop blood flowing backwards. |
|
|
How does the heart work? |
1. Blood flows into the two atria from the vena cava and pulmonary vein 2. Atria contracts forcing blood into the ventricles 3. Ventricles contract pushing the blood into the aorta and out the heart 4. Blood flows to organs through artieries and returnd through veins 5. Repeats |
|
|
What are the 3 types of blood cells? |
Veins - Carries blood to the heart Arteries - Carry blood away from the heart Capillaries- Involved in exchange of materials at tissue |
|
|
What are the Arteries like? |
They have strong and elastic the walls are thick compared to the lumen. |
|
|
What are capillaries like? |
Small and permeable to make diffusion easier. Walls are usually only one-cell thick |
|
|
What are veins like? |
Big lumen to help bloodflow and have valves to make sure blood the flow in the correct direction. |
