Cardiovascular system

Question 1

2.2.1/2.2.2 State the four components of blood and their function

Answer 1

Erythrocytes (red blood cells)- contain haemoglobin, carry oxygen around the body)
Leukocytes (White blood cells)- antibodies that fight disease/infection
Platelets (create a meshwork of fibres to help with clotting)
Plasma

Question 2

2.2.4 Instrinsic vs Extrinsic regulation of heart rate

Answer 2

Instrinsic regulation- self- regulating nature of the cardiac tissue (involuntary), maintains its own rhythm without direction

Extrinsic controls- those that come from both hormonal responses as well as commands from nervous system (EXTERNAL FACTORS)

Question 3

2.2.4 Sequence of excitation of the heart muscle

Answer 3

1. S-A node
2. A-V node
3. Bundle of His
4. Purkinje fibres

Question 4

2.2.4 Extrinsic regulation, sympathetic influence & parasympathetic influence

Answer 4

sympathetic influence- increased heart rate parasympathetic influence- decreased heart rate

Question 5

2.2.5 What is Pulmonary circulation and systemic circulation

Answer 5

Pulmonary circulation- caries DEOXYGENATED blood away from the heart to the lungs and returns oxygenated

Systemic circulation- carries oxygenated blood away from the heart to the body