Animal Tissue and Anatomy

The vocal cords (vocal folds) are two fibro-elastic bands located within the larynx. They stretch between the thyroid cartilage anteriorly and the arytenoid cartilages posteriorly.

• The epiglottis is a large, leaf-shaped piece of cartilage lying on top of the larynx. It projects obliquely upwards behind the tongue and the hyoid bone, pointing dorsally.
  
• During swallowing of food the larynx elevates, causing the epiglottis to fall on the glottis (opening into larynx) like a lid, closing it off, this prevents food from entering the windpipe (trachea). Hence The structure which prevents the entry of food particles into the respiratory passage is Epiglottis.
• So, the correct answer is 'Epiglottis'.
  

• Larynx is a cartilaginous box containing nine pieces of cartilages.
• Glottis is the opening from where esophagus and trachea gets seperated.
• To prevent food from entering into the larynx while swallowing, the epiglottis covers the opening of the larynx.
• So, the correct option is (A).

The cricoid cartilage is a ring of hyaline cartilage located at the inferior aspect of the larynx and is the only complete ring of cartilage around the trachea. It has the shape of a signet ring, with a broad portion posterior to the airway (lamina of cricoid cartilage) and a narrower portion circling anteriorly (arch of cricoid cartilage). 

Vocal cords are located within the larynx, which is why the larynx is commonly called the voice box. Air passing through these cords creates sound.

The vermiform appendix is also referred to as the cecal appendix. It is a blind ended tube connected to the cecum. The appendix is usually located in the right lower quadrant of the abdomen, near the right hip bone. Its position within the abdomen corresponds to a point on the surface known as McBurney's point.

Large intestine is differentiated into three parts cecum, colon and rectum. Cecum continues into colon. Colon is the middle part of large intestine. The longitudinal muscle coat forms three ribbon like bands called teniae coli. Due to the presence of teniae, pouch like structure develops in lumen of colon called as haustra. The colon then continues in a uniform tube called rectum, which is the storage chamber for faeces.

The vermiform appendix is attached to its posteromedial surface of the large intestine. It contains masses of lymphoid tissue. It is a part of mucosa-associated lymphoid tissue which gives the appendix an important role in immunity. Appendicitis is the result of a blockage that traps infectious material in the lumen. The appendix can be removed with no damage or consequence to the patient. 

Haemorrhoids, commonly known as piles, are swollen and inflamed veins in the rectum and anus that cause discomfort and bleeding.

The laryngeal prominence (commonly referred to as Adam's apple), a feature of the human neck, is the lump or protrusion that is formed by the angle of the thyroid cartilage surrounding the larynx. The structure of the laryngeal prominence forms a bump under the skin. It is larger in adult men, in whom it is usually clearly visible and palpable. In women, the bump is much less visible and is hardly perceived on the upper edge of the thyroid cartilage. The laryngeal prominence is related to the deepening of the voice.

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 stethoscope is an acoustic (hearing) medical device used for auscultation(listening of internal sounds of the body. The doctor will place a small metal circle called a bell (hallow disc) or diaphragm (plastic disc), against the chest, at the spot where a person can feel the heartbeat. The stethoscope is composed of rubber tube, earpiece and diaphragm.

The shared terminal duct of the reproductive and urinary system in the human male is urethra. In human male urethra is urinogenital duct which carry both urine and sperm.