Tag: breathing and respiration

There are two types of the carotid artery; one in left and one in the right. The external carotid artery supplies blood to the face and neck whereas internal carotid artery supplies blood to the brain.

Larynx (voice box) is located between the pharynx and the trachea. It is the upper modified part of trachea and leads to trachea or windpipe. It has a framework of cartilage that protrudes in the front of the neck and sometimes is referred as the Adams apple. The larynx is considerably larger in males than in females; hence, the Adams apple is much more prominent in males. At the upper end of the larynx, vocal cords are present which help in production of speech. They are set into vibration by the flow of air from the lungs. A difference in the size of the larynx is what accounts for the difference between male and female voices; because male larynx is larger than a female larynx, usually male voice is lower in pitch. The nasal cavities, the sinuses, and the pharynx all serve as resonating chambers for speech, just as the cabinet does for a stereo speaker.

Whale is a mammal and mammals breathe with lungs. The whale’s lungs contain more alveoli and is surrounded by two layers of capillaries increasing the surface area for more efficient gas exchange.

In humans, the larynx is called the voice box. The larynx (voice box) is located between the pharynx and the trachea. It has a framework of cartilage, that protrudes in the front of the neck and sometimes is referred to as Adam's apple. The larynx is considerably larger in the male than in the female; hence, Adam's apple is much more prominent in the male. At the upper end of the larynx are the vocal cords, which serve in the production of speech. They are set into vibration by the flow of air from the lungs. 

In humans, the larynx (voice box) is located between the pharynx and the trachea. It has a framework of cartilage that protrudes in the front of the neck and sometimes is referred to as the Adam's apple. The larynx is considerably larger in the male than in the female. Hence, the Adam's apple is much more prominent in the male. At the upper end of the larynx are the vocal cords, which serve in the production of speech. They are set into vibration by the flow of air from the lungs. A difference in the size of the larynx is what accounts for the difference between the male and female voices; because a man's larynx is larger than a womans, his voice is lower in pitch.

Pleura is one of the two membranes around the lungs. These two membranes are called the visceral and parietal pleurae. The visceral pleura envelops the lung, and the parietal pleura lines the inner chest wall. 

The larynx (voice box) is located between the pharynx and the trachea. It has a framework of cartilage that protrudes in the front of the neck and sometimes is referred to as the Adam's apple. The larynx is considerably larger in the male than in the female; hence, the Adam's apple is much more prominent in the male. In human males ventral surface of thyroid cartilage make up the Adam's apple. 

The larynx is known as voice box or sound producing organ. A pair of membranous folds called vocal cords, stretch across the laryngeal cavity. In normal condition, the vocal cords lie apart so that the glottis remains widely open to allow free passage of respiratory air. For sound production, vocal cords come close together, they vibrate when air rushes out through glottis and produce voice.

The epiglottis is a flap-like structure made of elastic cartilage tissue covered with a mucous membrane, attached to the entrance of the larynx. The main function of the epiglottis is to close off the windpipe during eating which prevents the entry of the food into the respiratory tract so that food is not accidentally inhaled. Hence option D is correct.

The Adam's Apple is the common name for the laryngeal prominence, which is a feature of the thyroid cartilage that surrounds the larynx. It is more prominent in males due to hormonal differences.