Animal tissues, organs and organ systems：练习题

Which enzyme is produced by the salivary glands and the pancreas to break down starch into simple sugars?

A patient is diagnosed with coronary heart disease. Which of the following evaluations correctly compares the use of statins and stents as treatments?

In the human heart, which specific chamber is responsible for pumping deoxygenated blood directly to the lungs?

Bile is an essential secretion for the digestion of lipids. Which of the following correctly describes where bile is produced and its functional role in the small intestine?

Name the organ system that contains the heart and blood vessels, and state its primary role in the body.

Explain the role of bile in the human digestive system and describe how its properties increase the rate of lipid breakdown by lipase.

Describe the biological mechanism of coronary heart disease and evaluate how the use of stents helps to treat this condition.

The picture shows a sample of human blood as seen through a light microscope.

a) Identify the components labeled A and B.

b) Describe the specific function of component C and explain how its structure is adapted for this role.

Enzymes are biological catalysts that increase the rate of chemical reactions in the body. The graph shows the effect of \( \text{pH} \) on the activity of two protease enzymes, X and Y.

a) Describe the 'lock and key' theory of enzyme action.

b) Enzyme X is found in the human stomach. Use the graph to state the optimum \( \text{pH} \) for this enzyme and explain why the activity of enzyme X decreases as the \( \text{pH} \) increases beyond this point.