I would go with the first option
Option 1 seems to be correct
Answer:
Insulin is the key hormone of carbohydrate metabolism, it also influences the metabolism of fat and proteins. It lowers blood glucose by increasing glucose transport in muscle and adipose tissue and stimulates the synthesis of glycogen, fat, and protein
Explanation:
Hello!! The answer would be A - The SA node. It is known as the "pacemaker" because it initiates the heart's rhythmic contractions. I hope I helped!! Have a great day. :)
experiment, in the scientific method the hypothesis is tested through experimentation and if confirmed is called a theory.
