The Heart Blood And Vessels

Question 1

We have a double circulatory system. Explain what they are and what they do

Answer 1

-Pulmonary circulation.
Transports blood to and from lungs to exchange O2 and CO2 with air
-Systemic circulation
Transports blood to and from body to exchange O2 and CO2 with bodily cells

Question 2

How do we control our heartrate

Answer 2

• we have osmoreceptors in aorta that sense CO2 levels
• cardiac centre in medulla receives information via the sensory nerve
• cardiac centre sends impulses via accelerator or decelerator nerves
• pacemaker reacts and increases or decrease his heart rate and force of heartbeat

Question 3

Why is a blockage of the coronary artery so bad

Answer 3

• Blood supply to area of heart muscle cut off
• Less oxygen and glucose reaches heart muscle
• Area of heart muscle cannot respire
• Heart attack (angina)

Question 4

Explain a bit about the artery

Answer 4

• Takes oxygenated blood away from the heart to the body
• High blood pressure
• Oxygenated blood

Question 5

Explain a bit about the vein

Answer 5

Brings deoxygenated blood to heart from body

• Low blood pressure
• Deoxygenated blood

Question 6

Explain about the capillaries

Answer 6

Small vessels between arteries and veins for exchange of O2 and CO2 and nutrients with cells
-Low blood pressure

Question 7

How much of the blood is plasma, white blood cells and platelets, red blood cells

Answer 7

• Plasma (55%)

- White blood cells and platelets (

Question 8

What is plasma

Answer 8

The liquid part of the blood

- contains clotting factors, hormones, antibodies…

Question 9

What is white blood cells

Answer 9

Either leukocyte or platelets

• leukocyte- defence against disease, phagocytes ingest pathogens. Lymphocytes produce antibodies
• platelets-thrombocytes are involved in blood clotting

Question 10

What does the red blood cell do

Answer 10

Transports oxygen.

Question 11

Vein……

Artery……

Answer 11

Vein to the heart

Artery from the heart