The pie chart shows three main factors contributing to energy ...

[iveyjurea]

The pie chart shows three main factors contributing to energy utilization in the body. Of these, which are the most responsive to lifestyle choices?
  1.Physical Activity
  2.Physical Activity and BMR
  3.BMR and Thermic Effect
  4.Thermic Effect and Physical Activity
  5.All three are equally responsive
 
Question 2

Briefly describe the actions of the body's phagocytes and lymphocytes (hint: include 3 cell types).

[Amiracle]

Answer to Question 1

1

Answer to Question 2

Phagocytes. These scavenger cells travel throughout the body and are the first to defend body tissues against invaders. When a phagocyte recognizes a foreign particle, such as a bacterium, the phagocyte forms a pocket, engulfing the invader. The phagocytes may then attack the invader with an oxidative burst or may otherwise digest or destroy it. Phagocytes also leave a chemical trail that helps other immune cells to find the infection and join the defense.
T-cells. Killer T-cells are lymphocytes that read and remember the chemical messages put forth by phagocytes to identify invaders. The killer T-cells then seek out and destroy all foreign particles having the same identity. T-cells defend against fungi, viruses, parasites, some bacteria, and some cancer cells. They also pose a formidable obstacle to a successful organ transplant because T-cells attack the foreign organ. Another group, helper T-cells, does not attack invaders directly but helps other immune cells to do so.
B-cells
. B-cells respond rapidly to infection by dividing and releasing invader-fighting proteins, antibodies, into the bloodstream. Antibodies travel to the site of the infection and stick to the surface of the foreign particles, killing or inactivating them. Like T-cells, B-cells retain a chemical memory of each invader, and if the encounter recurs, the response is swift.

[iveyjurea]

Thanks

[Amiracle]

Welcome