B6 - Biology Health

Question 1

What does the term obese mean?

Answer 1

Very overweight, largely because of excess fat in the body

Question 2

How do humans become obese?

Answer 2

A combination of over-eating fatty and sugary foods, together with little exercise

Question 3

What problems are caused by a person being obese?

Answer 3

More energy is required to move heavy parts of the body, so more work has been done by the heart to pump the extra blood to the cells to achieve this. Extra weight can cause damage to joints.

Question 4

Where does fertilisation take place in humans?

Answer 4

In the oviduct (fallopian tube)

Question 5

What happens to the wall of the uterus if fertilisation does not take place? What is this process called? What is the name of the cycle? What is the average duration of the cycle?

Answer 5

The wall breaks down and passes out of the vagina. Menstruation or ‘having a period. Menstrual cycle. The average cycle takes 28 days.

Question 6

Name one substance that passes across the placenta from the fetus to the mother.

Answer 6

Carbon dioxide or waste products such as urea

Question 7

7) Name two substances that pass across the placenta from mother to the fetus.

Answer 7

Oxygen and nutrients

Question 8

Explain why blood system of the mother is an entirely different system from the blood system of the fetus

Answer 8

The mother may have an entirely different blood group form the fetus – these must never mix. The mother’s blood pressure will be much higher than that of the fetus

Question 9

State two ways in which the fetus will be protected while it is developing in the uterus

Answer 9

It is carried inside the body; protected by the thick walls of the uterus; surrounded by protective fluid contained within the amniotic sac