Which of the following correctly describes the structure and function of tissue layers found in blood arteries and veins?

Tunica media; contains muscle that constricts the vessels to increase blood flow

Tunica media; contains connective tissue that provides structural support

Tunica externa; contains connective tissue that provides structural support and elastin that prevents backflow

Tunica externa; contains muscle that constricts the vessels to increase blood flow and elastin that prevents backflow

Explanation:

Tunica media; contains connective tissue that provides structural support  

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.

this transfer is call conjunction