The middle layer contains smooth muscle tissue, which contracts and relaxes to push blood. It also contains elastic connective tissue, which helps to regulate blood pressure. How do the two tissues in the middle layer relate to the artery's function?

Answer and explanation:

Arteries are the blood vessels that take blood from the heart to the tissues where it's needed. For this task to be achieved, arteries have different structures and properties in each of their layers.

Arteries have 3 layers, also called tunicas: the intima (in contact with the blood), the media, and the adventitia (the most external layer).

The media -or middle layer- is composed of smooth muscle tissue and elastic connective tissue. This tunica is usually the thickest of the three and has a hugely important role in blood flow and blood pressure regulation.

Blood pressure (BP) is a variable that the body needs to maintain in a range for everything to work effectively. When blood pressure falls, the middle layer of the artery contracts (both in response to the change in blood flow and thanks to the action of specific hormones) so blood can flow somewhat faster and compensate for the disturbance in BP. On the other hand, when blood pressure rises, the middle layer of the artery dilates, to make the blood flow slower.

Smooth muscle tissue is fundamental for contraction, while elastic connective tissue is needed for dilatation.

question#1

ans:

cell is the basic unit of organization of all living things. cells are often called the building block of life and it is the smallest unit of life. the study of cell is called cell biology. cell consists of cytoplasm enclosed within membrane, which contain bio-molecules such as proteins and nucleic acid.

two third of cell is water, which means that two-third of your whole body is water. the rest is the mixture of molecules, mainly proteins, lipids and carbohydrates.

question#2

ans:

organ:

an organ is a group of tissues specialized to form a functional unit. an example is the heart in animals.

organ system:

an organ system is a group of several organs whose functions are synchronized to release an effective action in a living organism. an example is digestive system.

question#3

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#4

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system—working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#5

our body works because of the interactions that happen between organs and organ systems.  

for example:  

the heart to regulate blood flow throughout the body. the blood carries oxygen and nutrients to the cells and carries carbon dioxide and waste away from the cells. body systems work together in maintaining a constant internal environment. when this balance is disrupted, the body systems may not function properly, and human health can suffer.   you start to feel bad.