Inspiration occurs when intra-pulmonary pressure is

State whether the given statements are true or false.
$I.$ Ventilation in humans is an active process.
$II.$ Diaphragm helps in generating the pressure gradient in the lungs.
Choose the correct option.

Name the important parts involved in creating a pressure gradient between the lungs and the atmosphere during normal respiration.

When does blood pressure increase during the respiratory cycle?

The intake and output of air from the lungs is helped by

Define the following terms:
$(1)$ Inspiration
$(2)$ Expiration