Question

What are twins.Explain aids.Distinguish between exocrine and endocrine glands class?

Answer 1

Hey mate, there are the answers:


1.Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic ("identical"),meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic ("fraternal"),meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell.

2.An endocrine gland secretes its products, for example hormones, directly into the blood. An example of an endocrine gland is the adrenal gland which secretes adenaline made in the adrenal medulla directly into the blood.
 
An exocrine gland secretes its products for example enzymes, into ducts that lead to the target tissue. For example the salivary gland secretes saliva into the collecting duct which leads to the mouth.