There are three muscles located in the anterior compartment of the upper arm â biceps brachii, coracobrachialis and brachialis. They are all innervated by the musculocutaneous nerve. A good memory aid for this is BBC â biceps, brachialis, coracobrachialis.
Calcitonin is a hormone secreted by the thyroid gland that reduces the concentration of blood calcium level when it has risen to an above normal level. This polypeptide hormone is made up of 32 amino acids and is produced mainly by the parafollicular cells (also known as C cells) of the thyroid gland.
Calcitonin is released from thyroid gland in response to hypercalemia. On the other hand, parathyroid hormone-as you guessed-is from parathyroid gland in response to low le â¦ vels of blood calcium. Which will cause calcium to be released from bone into blood to compensate.