Blood And Heart

Question 0

Name 3 factors which decrease heart rate

Answer 0

Fitness
Sleep
Relaxation

Question 1

Name 5 factors which increase heart rate

Answer 1

Exercise 
Body temp
Stress
Emotion
Infection

Question 2

Give 3 factors which affect the circulatory system

Answer 2

Smoking
Diet
Exercise

Question 3

Explain the affects of smoking on the circulatory system

Answer 3

Nicotine increases heart rate and blood pressure which puts pressure on the heart
Carbon monoxide reduces the amount of oxygen carried by the blood so the heart has to pump faster
Higher risk of blood clots, hypertension, atherosclerosis

Question 4

Explain the affects of diet on the circulatory system

Answer 4

Fatty foods contain cholesterol which can lead to atherosclerosis
High salt intake increases blood pressure and heart disease
Lack of iron reduces hemoglobin therefore oxygen levels
Obesity puts the heart under more pressure

Question 5

Explain the effects of exercise on the circulatory system

Answer 5

Regular exercise improves size, strength and efficiency of the heart
Heart rate at rest is lower and recovery rate is faster
Blood flow improves

Question 6

SA node stands for

Answer 6

Sino atrial

Question 7

AV nodes stands for

Answer 7

Atrio ventricular

Question 8

Give the cause and effects of leukemia

Answer 8

Cause : over- production of white blood cells
Effects : increase susceptibility to disease
anaemia - low oxygen

Question 9

Give the cause and effects of hemophilia

Answer 9

Cause: lack of at least one clotting chemical
Effects: inability to form blood clots
Can cause excessive bleeding

Question 10

Explain the Rhesus factor

Answer 10

Presence or absence of Rhesus antigen on the surface of red blood cells
Only problematic if a mother is Rh- and unborn child is Rh+
Successfully managed with medication

Question 11

Give 4 functions of the blood

Answer 11

Transport of food, waste products, hormones
Distributes heat around the body
Transport of oxygen in the form of oxyhemoglobin
Defence against disease
- phagocytes engulf
- lymphocytes produce antibodies
- platelets clot the blood

Question 12

What is blood pressure?

Answer 12

The pressure exerted by the blood on the walls of the arteries
2 values - high -pressure when heart contracts
Low- pressure when heart relaxes
120/80 is a healthy blood pressure