Question

a feedback mechanism in the human body is shown. based on this diagram, which two systems interact to maintain homeostasis? the excretory and nervous systems work together to convert glycogen into glucose. the circulatory and endocrine systems work together to keep blood sugar levels constant. the immune and circulatory systems work together to circulate blood through the pancreas. the nervous and reproductive systems work together to stimulate the production of insulin.

Explanation:

• The endocrine system is involved as the pancreas (an endocrine gland) secretes insulin and glucagon. Insulin and glucagon are hormones that regulate blood - glucose levels.
• The circulatory system is involved because blood (part of the circulatory system) transports glucose, insulin, and glucagon throughout the body. When blood glucose levels rise above normal, the pancreas releases insulin. Insulin travels through the blood (circulatory system) to the liver, where it allows the liver to convert excess glucose into glycogen, lowering blood - glucose levels. When blood glucose levels fall below normal, the pancreas releases glucagon. Glucagon travels through the blood to the liver, allowing the liver to convert glycogen into glucose, raising blood - glucose levels. This interaction between the endocrine (pancreas) and circulatory (blood transport) systems helps maintain the homeostasis of blood - glucose levels.

• The excretory system is mainly for removing waste products (like urine formation), and the nervous system is for transmitting electrical and chemical signals for control and coordination. They are not the main systems here. The immune system is for defense against pathogens, and the reproductive system is for reproduction. These systems are not relevant to the blood - glucose regulation shown in the diagram.

Answer:

The circulatory and endocrine systems work together to keep blood sugar levels constant.