Circulaton by

1: Open vs. closed blood systems

missmuldrew — 2017-06-11 22:20:29 UTC

Open:

- blood is spread throughout the organism

- blood moves slowly

- examples: arthropods, molluscs

Closed:

- blood is contained in blood vessels

- blood moves rapidly

- examples: fish, mammals

2: Single vs. double circulation

missmuldrew — 2017-06-11 22:20:53 UTC

Single:

- blood passes through the heart once during each cycle

- examples: fish

Double:

- blood passes through the heart twice during each cycle

- examples: mammals

3: Double circulation

missmuldrew — 2017-06-11 22:20:57 UTC

The pulmonary circuit pumps blood from the heart to the lungs and then back to the heart.

The systemic circuit pumps blood from the heart to the body and then back to the heart.

4: Mammal heart as a double pump

missmuldrew — 2017-06-11 22:21:07 UTC

The mammal heart is completely separated into two halves.

Right side:

- deoxygenated blood

- receives blood from body

- pumps blood to lungs

- less muscular

Left side:

- oxygenated blood

- receives blood from lungs

- pumps blood to the rest of the body

- more muscular

5: Differences in pressure

missmuldrew — 2017-06-11 22:21:13 UTC

The right side of the heart pumps with less pressure than the the left.

Why is this important?

- high pressure blood can result in fluid entering the lungs, which would affect gas exchange

- kidneys need high pressure blood to function

- we can increase pressure/blood flow to our muscles during exercise

6: Importance of blood

missmuldrew — 2017-06-11 22:21:18 UTC

Parts of our bodies have different functions, e.g.:

- lungs supply oxygen and remove carbon dioxide

- intestines absorb nutrients from food

- liver processes nutrients and toxins

- kidneys remove waste

Blood allows these substances to be transported throughout the body quickly (compared to diffusion alone).

Blood can also transfer heat.