Circulatory System Flashcards
1
Q
Open circulatory system
A
Blood is not carried in a system of blood vessels (e.g. insects)
2
Q
Insects circulatory system
A
- Blood pumped into fluid-filled haemocoel cavities
- Blood bathes tissue directly and exchange takes place and blood flows back to heart
- Muscles and valves move to assist movement of blood back to heart
- No respiratory pigment as O2 transported by tracheae
3
Q
Closed circulatory system
A
- Blood circulates/ carried in a system of blood vessels
- Transported from exchange surfaces to tissues
- Tissues not in direct contact with blood but bathe in tissue fluid
- Hb as respiratory pigment
4
Q
Why is closed more efficient?
A
- Blood pumped at higher pressure
- Can be directed to where needed
- Efficient delivery of nutrients and removal of waste
5
Q
Single circulation
A
- Blood passes through heart once in a complete circuit and stays in vessels on a single pathway
- Fish and earthworms
- Pressure is lost when blood passes through capillaries
- Blood flow through systemic circulation is slower
6
Q
Earthworm single circulation
A
- 5 pairs of pseudo-hearts
- Muscular vessels that pump blood from dorsal to ventral vessel (front and back)
7
Q
Double circulation
A
- Blood passes through heart twice in 1 complete circuit
- Separate systemic and pulmonary circulations
8
Q
Pulmonary circulation
A
- Serves lungs
- Deoxygenated blood to lungs
- Oxygenated blood to heart
9
Q
Systemic circulation
A
- Serves the body tissues
- Oxygenated blood to tissues
- Deoxygenated blood back to heart
10
Q
Advantages of double circulation
A
- Maintains high blood pressure in systemic circulation
- Rapid circulation of blood
- To meet high metabolic need of mammals
- Separates/ no mixing of oxygenated and deoxygenated blood
