Circulatory System:Purpose:

- To deliver O2 & nutrients to all the cells of the body.-To transport waste, produced by the cells,to the gills and kidneys for excretion.

-Examples of cellular waste:-Carbon dioxide-ammonia

1. Closed circulatory systemContained in blood vessels

2. A 1 loop system

Fish have:

3. A low efficiency systemWhy?

Clean and dirty blood mix

A fish’s 1 loop system is made up of:

Heart: pumps the blood

Arteries: carries blood away from heart

Veins: carries blood to the heart

Capillaries: connects arteries to the veins

-systemic (supply body)-respiratory (supply

gills)

Circulatory System

Pathway of Blood:

1. Heart pumps blood thru arteries to capillaries in the gills

2. Blood picks up O2 & releases CO2 through the gills

3. From the gills the blood travels to body tissues where nutrients & wastes are exchanged

4. Blood goes back to heart thru veinsveins

12

3

4

Heart

arteries

gills

veins

Gill capillaries

A Fish’s heart- 1. muscular pump that circulates blood around body

2. Has 2 chambers

Atrium

(upper)

Ventricle

(lower)

Circulatory System:

4. Bulbus arteriosus

2. Atrium

5. To gills

3.Ventricle

1. Sinus venosus

Pathway thru HEART:

1. CO2 dirty blood returns from body to Sinus Venosus (collection area)

2. To large Atrium3. To muscular Ventricle (PUMP)4. To Conus/Bulbus Arteriosus~ saturated with blood vessels

-has valves to decrease backflow5. To Aorta (large artery) to body

Circulatory System