B9-Transport in animals

Revision flashcards for this topic

Circulatory system

The circulatory system consists of the heart, blood vessels (arteries, veins, and capillaries), valves, and blood.

How is blood pumped in the heart

Blood is pumped away from the heart int he arteries and retuns to the heart in the veins.

The four chambers of the heart

The heart has four chambers: the right atrium, right ventricle, left atrium, and left ventricle.

How does the heart work

1. Blood flows from the veins into the atria

2. Atrial contraction pumps blood into ventricles

3. Ventricular contraction causing the blood to flow into the arterties

How can we monitor the heart

.ECG

.Pulse rate

.Listien to your heart

What happens when someone has Cornary heart disease

Cornary arteries can be blockedand the supply to the heart muscle can be interupted. A complete bockage can result in a heart attack. Arteries become blocked due to plaque

Risk factors of CHD

1.Poor diet

2. lack of exersise

3.stress

4,genetics

5,age

6.Gender

7.Smoking

Arteries

Blood flows away from the heart. Blood enters the arteries at high blood preasure. Atery walls strech.

Capillaries

Capillaries are where substances are exchanged between blood and the surrounding cells.

Veins

Blood enters the veins after leaving the capillaries. Blood pressure is lower .