Biology Study Set 13
Quiz 41 :
Maintaining the Internal Environment
The two most common eating disorders are anorexia nervosa and bulimia nervosa. In anorexia nervosa, a person start to starve him, which makes them hungry; however, in bulimia, a person starts to eat a huge amount of food at short intervals. Both conditions affect the health of the person. It has been found that people suffering from bulimia have ideal weights while people suffering from anorexia nervosa are thin and underweight. It has been surveyed that most of the people affected by these disorders belongs to the group of adolescents especially females who are more obsessed with their weight. Males suffer less than females from these disorders. Out of the total mortality rates, it has been found that about 4% die of anorexia nervosa while 3.9% die from bulimia. Hence, anorexia nervosa and bulimia are the two eating-disorders highly affecting the adolescents.
Digestive system is the specialised system for digesting and absorbing the food that we ingest. It has several other functions also such as: • It secretes many enzymes that helps in digestion of food. These include trypsin, insulin, gastric enzymes, etc. • It coordinated with other systems of the body and functions in eliminating waste from the body. • Small intestine is the major site where most of the nutrients are absorbed. Hence, the correct option is (d) 'all of the above'. Digestive system plays role in secreting enzymes, eliminating waste as well as absorbing compounds. Thus, option d is correct. Hence, options (a), (b) and (c) are incorrect.
A python can swallow something that is wider than it is because it has different jaw structure that can stretch to a large width. The jaws of the python are connected with the ligaments that can stretch allowing the python to widen its mouth and engulf the prey. The ribs of python are also movable which helps it to make space for the prey in its stomach which secretes strong gastric juices for digesting the prey. Hence, python can swallow its prey which is wider than itself.