Function of the following

1epiglottis 2haemoglobin 3alveolar sacs 4larynx 5diaphragm

Explain various types of ribs present in a rib cage

1. Epiglottis- The main function of the epiglottis is to seal off the windpipe during eating, so that food is not inhaled.

2. Haemoglobin- It carries oxygen from the lungs to the tissues and return CO₂ from the tissue to the lungs.

3. Alveolar sacs- It allows oxygen and carbon dioxide to move between the lungs and bloodstream.

4. Larynx- It keeps food and drink out of the airways during swallowing.It also produces voice by modulation of air passing through vocal cords.

5. Diaphragm- The contraction and expansion of the diaphragm helps to inhale and exhale air from the lungs.

 

Various types of ribs include-

• True ribs: The first 7 pairs of ribs are attached in the front to the sternum with the help of a hyaline cartilage. They are called true ribs.
• False ribs: The next 3 pairs of ribs are fused and attached to the sternum indirectly. These are called false ribs. The 8^th, 9^th and 10^th pair of ribs join the 7^th rib.
• Floating ribs: The last two, 11^th and 12^th pairs of ribs, are not attached to the sternum but hang freely. These are called floating ribs.