Question

people with diabetes often receive insulin injections. what effect does insulin have on the body?
it raises blood - sugar levels
it lowers blood - sugar levels.
it raises glucagon levels.
it lowers glucagon levels.

Explanation:

Insulin is a hormone produced by the pancreas. Its main function is to regulate blood - sugar levels. When blood - sugar levels rise (for example, after a meal), insulin is released. It promotes the uptake of glucose by cells (such as muscle cells, fat cells, and liver cells). In muscle and fat cells, glucose is either used for energy (in muscle cells) or stored as fat (in fat cells). In liver cells, glucose is stored as glycogen. By facilitating the uptake and storage of glucose, insulin lowers blood - sugar levels.
Glucagon, on the other hand, has the opposite effect of insulin. It is also produced by the pancreas (by different cells). Glucagon is released when blood - sugar levels are low. It promotes the breakdown of glycogen in the liver to glucose (glycogenolysis) and the production of glucose from non - carbohydrate sources (such as amino acids) in the liver (gluconeogenesis), thereby raising blood - sugar levels. Insulin does not directly raise glucagon levels. And while insulin and glucagon are part of a feedback loop, insulin's primary and most direct effect is on blood - sugar levels, not a simple lowering of glucagon levels in the way described in the option.

Answer:

It lowers blood - sugar levels.