g Glucagon is a hormone that is released when the level of glucose in the blood is low. Glucagon uses a G protein signalling pathway to promote glycogenolysis. Put the steps of the signal transduction pathway in order after the release of glucagon into the blood before glycogen phosphorylase is activated leading to glycogenolysis. 1. Glucagon binds extracellularly to G protein-coupled receptor. 2. G protein releases GDP and binds GTP. 3. Activated G protein activates adenylyl cyclase. 4. Adenylate cyclase converts ATP to cAMP. 5. Cyclic AMP activates protein kinase A.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

a = executive branch; b = judicial branch

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers