Question

Inhale:
The ribcage is made to move upwards and outwards by contracting the muscles between the ribs - the _______ intercostal muscles. The diaphragm moves down becoming flatter by contracting. This makes the chest cavity increase in volume and decrease in pressure. This pulls the lungs outwards and makes them bigger, so air is pushed in through the trachea.

Exhale:
The ribcage is made to move downwards and inwards by relaxing the muscles between the ribs - the ______ intercostal muscles. The diaphragm moves up becoming domed shaped by relaxing. This makes the chest cavity decrease in volume. This pulls the lungs inwards and makes them smaller, so pressure increases and the air is pushed out through the trachea.

Fill in the blanks

Answer 1

Answer:

1. External intercoastal muscle

2.internal intercoastal muscle

Explanation: