I'm stuck on these---

9. Most of the end products of digestion are absorbed into the circulatory system from which organ?
a. liver
b. pancreas
c. large intestine
d. small intestine

11. Pancreas is to small enzymes as
a. stomach is to saliva
b. stomach is to proteins from amino acids
c. liver is to bile
d. liver is to hydrochloric acid

12. Ureter is to urinary bladder as
a. urinary bladder is to ureter
b. uretha is to urinary bladder
c. uretha is to ureter
d. urinary bladder is to uretha

Please help

Thanks
-MC

9. The correct answer is d. small intestine.

The majority of the end products of digestion, such as nutrients, are absorbed from the small intestine into the circulatory system. The small intestine has specialized structures called villi and microvilli, which increase its surface area and enhance nutrient absorption.

11. The correct answer is b. stomach is to proteins from amino acids.
The pancreas is responsible for producing and releasing digestive enzymes, including proteases, which break down proteins into amino acids. These enzymes are released into the small intestine to aid in the digestion and absorption of proteins.

12. The correct answer is b. urethra is to urinary bladder.
The ureter is a muscular tube that carries urine from the kidneys to the urinary bladder. Conversely, the urethra is a tube that carries urine from the urinary bladder to the external body. Therefore, the relationship between the ureter and the urinary bladder is similar to the relationship between the urethra and the urinary bladder.

To answer these questions, we need to understand the functions of the organs mentioned:

9. The correct answer is d. small intestine. The small intestine is responsible for the majority of nutrient absorption from digested food. It has a large surface area lined with villi and microvilli, which increase absorption efficiency. This organ plays a crucial role in the absorption of nutrients such as carbohydrates, proteins, fats, vitamins, and minerals into the circulatory system.

11. The correct answer is b. stomach is to proteins from amino acids. The pancreas secretes pancreatic enzymes, including proteases, which are responsible for breaking down proteins into amino acids. The stomach, on the other hand, secretes gastric juices containing pepsin, which begins the digestion of proteins into peptides. While saliva does contain enzymes like amylase for carbohydrate digestion, it is not directly related to the pancreas in the same way the stomach and pancreas are linked for protein digestion.

12. The correct answer is b. uretha is to urinary bladder. The ureter is a tube that connects the kidneys to the urinary bladder, transporting urine from the kidneys to be stored in the bladder. The urinary bladder, on the other hand, stores the urine until it is ready to be voided. The urethra is the tube that carries urine from the bladder out of the body during urination. Therefore, the relationship between the ureter and urinary bladder is similar to the relationship between the urethra and urinary bladder.

To solve these questions, it's vital to have a good understanding of the functions and anatomy of the organs involved.