Biology Trivia Questions On Digestive System! Quiz

Absorption occurs with the help of the villi. Villi are small finger-like projections found in the small intestine that increase the surface area for absorption of nutrients. They have a rich blood supply and contain specialized cells called enterocytes, which have microvilli on their surface. These microvilli further increase the surface area for absorption. The villi play a crucial role in absorbing nutrients such as sugars, amino acids, and fatty acids from the digested food into the bloodstream for distribution to the body's cells.

Protease is an enzyme that breaks down proteins. It has an optimal pH level at around 2, which means it functions most effectively in an acidic environment. This acidic pH helps protease to denature proteins and facilitate their digestion. The answer "2" and "two" both indicate the same pH level, which is the optimal pH for protease activity.

Amylase is an enzyme that breaks down complex carbohydrates into simpler sugars. It is primarily found in saliva, where it begins the process of digestion by breaking down starches into maltose. This allows for easier absorption and utilization of carbohydrates by the body.

Assimilation is the process by which absorbed nutrients are incorporated into the body's tissues and used for various functions. It occurs after absorption because absorption is the process by which nutrients are taken up by the body from the digestive system into the bloodstream. Once absorbed, these nutrients are then assimilated into the cells and tissues of the body. Therefore, it is correct to say that assimilation happens after absorption.

Digestive enzymes work best at a temperature of 37 degrees Celsius. This is the normal body temperature of humans, and it is the optimal temperature for the enzymes to function effectively in breaking down food into smaller molecules that can be absorbed by the body. At this temperature, the enzymes have the right amount of energy to catalyze the chemical reactions involved in digestion.

Digestion could not be carried out without digestive enzymes. This statement is false. While digestive enzymes play a crucial role in breaking down food into smaller molecules that can be absorbed by the body, digestion can still occur to some extent without them. For example, mechanical digestion, where food is physically broken down by chewing and stomach contractions, can still take place even without the presence of digestive enzymes. However, the efficiency and effectiveness of digestion would be significantly reduced without these enzymes.

The stomach secretes hydrochloric acid (HCL) which kills bacteria. This is important for preventing the growth of harmful bacteria in the stomach and maintaining a healthy digestive system. Additionally, the stomach's pH level of approximately 3-4 provides an optimum condition for the enzyme pepsin to work. Pepsin is responsible for breaking down proteins into smaller molecules, aiding in the digestion process.

The digestive system is a complex series of organs and processes that break down food into nutrients the body can use. The correct order of the parts of the digestive system is:

Mouth: where food is mechanically broken down by chewing and mixed with saliva.

Esophagus: a muscular tube that propels food from the mouth to the stomach.

Stomach: a J-shaped organ where food is further broken down by acids and enzymes.

Small intestine: a long, coiled tube where most of the digestion and absorption of nutrients occur.

Large intestine: a shorter, wider tube where water is absorbed and waste products are formed.

Colon: the final part of the large intestine where waste products are stored before elimination.

Anus: the opening through which waste products are expelled from the body.