If these are the percentage of gases you breathe in, what will the percentage of the gases you breathe out be? Nitrogen = 78% Oxygen = 21% Carbon Dioxide = 0.04%

A: Nitrogen = 78% Oxygen = 21% Carbon Dioxide = 0.04%

B: Nitrogen = 78% Oxygen = 16% Carbon Dioxide = 4%

C: Nitrogen = 99% Oxygen = 0% Carbon Dioxide = 0.04%

D: Nitrogen = 50% Oxygen = 25% Carbon Dioxide = 25%

B: Nitrogen = 78% Oxygen = 16% Carbon Dioxide = 4%

Explanation:

We, as humans, undergo the process of cellular respiration in order to release energy for use. However, we require oxygen (O2) to perform this process of respiration and release carbon dioxide (CO2) as a waste product. The oxygen is obtained when we breathe in air, which contains the following gases in the following proportions:

Nitrogen = 78% Oxygen = 21% Carbon Dioxide = 0.04%

However, a part of the oxygen component of these air is used for cellular respiration. Hence, the percentage of oxygen in the exhaled air will reduce while the percentage of carbon dioxide will increase. The composition of gases in the exhaled air is as follows:

Nitrogen = 78% Oxygen = 16% Carbon Dioxide = 4%

Note that, oxygen reduced (21%-16%), and carbon dioxide increased (0.04%-4%). Nitrogen is not used in cellular respiration, hence, the composition does not change.

"menstrual cycle is a complex cycle that consists of several processes. order of occurrence of steps in menstrual cycle are as follows:

1. high progesterone levels maintain the endometrium lining of the uterus.

2. endometrium lining breaks down and low levels of estrogen stimulate the pituitary to release fsh and lh.

3. fsh and lh stimulates the follicles to develop and the oocyte to produce estrogen.

4. rising estrogen levels suppress fsh production and development of other follicles.

5. a spike in lh causes follicle to rupture.

6. a breakdown of corpus luteum causes progesterone level to drop."

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.