AP BIOLOGY

Detailed explanation-1: -Crop: A pouch in the esophagus used to store food temporarily before moving it on to the stomach. Stomach (Proventriculus/Gizzard): Principally the organ where food is broken into smaller units. It has two parts: the proventriculus for storage and the gizzard.

Detailed explanation-2: -The crop stores food temporarily and starts the digestion process before it enters the stomach. It is a thin-walled pouch at the base of the esophagus where birds can store food before it is sent the rest of the way to the stomach.

Detailed explanation-3: -Crop. The crop is an out-pocketing of the esophagus and is located just outside the body cavity in the neck region (see Figure 3). Swallowed feed and water are stored in the crop until they are passed to the rest of the digestive tract.

Detailed explanation-4: -Birds have a glandular stomach, or proventriculus, and muscular stomach or gizzard. The glandular stomach receives food from the esophagus, and secretes mucus, HCl and pepsinogen, similar to what is seen in the mammalian stomach.

Detailed explanation-5: -The gizzard is the second chamber of the stomach and it consists of very tough muscles. These muscles are used to grind and digest various types of foods. The muscles don’t do this process alone. Many birds pick up small pebbles, sand or grit while they are eating and these items end up in the gizzard.