Question

Given below are groups of terms. In each group, the first pair indicates the relationship between the two terms. Rewrite and complete the second pair on a similar basis.
Foetus: Amnion:: Heart: ___.

Answer 1

The outer covering of the foetus:

1. The membrane which protects the fetus and secretes a protective fluid is an amnion or amniotic sac.
2. The amniotic cavity develops above the embryo.
3. The amniotic fluid absorbs shock and prevents desiccation of the embryo.

The outer covering of the heart:

1. Similarly, the heart is enclosed in a membranous sac called the pericardium.
2. The pericardium lubricates the heart and provides mechanical protection.

Final answer

Fetus: Amnion:: Heart: Pericardium.