The pulmonary artery and its branches deliver blood rich in carbon dioxide (and lacking in oxygen) to the capillaries that surround the air sacs. The circulation of the blood through the lungs. The veins that return the oxygenated blood from the lungs to the left atrium of the heart.
The aspect of Robert's health that is directly affected by his lack of contact with others is physical. It is fundamental to achieve overall health.
<h3>Health components and physical health</h3>
Health can be defined as an overall state of wellness, which is associated with physical, mental, and emotional health.
Mental health can be defined as cognitive functions associated with heath.
Emotional health refers to the control of feelings and behaviors.
Physical health is a health component associated with the absence state of physical injuries.
Learn more about physical heath here:
brainly.com/question/1492300
Answer:
There are 3 main types of T cells: cytotoxic, helper, and regulatory. Each of them has a different role in the immune response. Cytotoxic T cells (Tc cells) have a co-receptor called CD8 on their cell surface. CD8 partners with the T cell receptor and with MHC class I molecules, acting as a sort of bridge.
Explanation:
