Final answer:
Constipation can be caused by both lack of absorption of water and excess absorption of water in the large intestine, while enzymes in the small intestine and protein absorption are not direct causes. Large intestine damage may also play a role.
Step-by-step explanation:
Constipation is a condition characterized by hard and difficult-to-pass feces, often resulting from digestive system issues. There are two possible reasons for this condition:
- Lack of absorption of water by the large intestine.
- Excess absorption of water by the large intestine.
The absence of enzymes in the small intestine does not directly cause constipation; rather, it would affect digestion. Absorption of proteins is also not directly related to fecal hardness. However, damage to the large intestine can contribute to constipation by affecting its ability to function normally, including the absorption processes.