BIOLOGY 3 Marks Question

Glands are classified into exocrine glands and endocrine glands.

Exocrine Glands	Endocrine Glands
The glands which have a duct to pour out their secretion, are called exocrine glands.	The glands which do not have a duct and pour out their secretion directly into the blood, are called endocrine glands.
They secrete mucus, enzymes, sebum, tear, etc.	They secrete hormones.
Example: salivary glands, tear glands, etc.	Example: thyroid, pituitary, pineal glands, etc.

Cardiac muscle is specialized tissue that is found only in the heart. It has characteristics similar to both smooth and skeletal muscle tissue, as well as specialized properties that allow it to function with fast but sustained contractions, rapid conduction and coordinated movement. There are also differing types of cardiac muscle tissue that allow for both strong and coordinated contractions.