The events of inspiration begins with the;
Impulses are conducted on the phrenic nerve to muscle fibers in the diaphragm contracting them.
As the dome shaped diaphragm moves downward the thoracic cavity expands.
At the same time the external intercostal muscles may contract raising the ribs and expanding the thoracic cavity further.
The intra-alveolar pressure decreases
Atmospheric pressure greater than intra-alveolar pressure forces the air into the respiratory tract through the air passages.
The lungs fill with air.
Answer:
a
Explanation: because a prokaryote is a simple single-celled organism that lacks an organized nucleus or any other membrane-bound organelle
Type of neuron that receives messages from the environment is a sensory neuron ie it receives messages from the 5 senses which are used by man to investigate the environment.
Answer:
Planet diameter = 2p × (distance to the planet) × (planet's angular size in degrees)/360°. Planet volume = (p/6) × (planet diameter)3. Density = mass/volume.
Explanation: