A network of neural cells called neurons helps the human body communicate with itself. These neurons require a very specific concentration of sodium and potassium inside and outside of their cells. In order to maintain this balance a protein, which uses energy, works to pump these ions against the concentration gradient. What is this process called? A. Passive transport
B: Facilitated diffusion
C: Active transport
D: Osmosis

idk what happened..you tell

answerblank(1); afferent neurons; blank(2); efferent neurons;

ans.

in united states (us), the first leading cause of death for both women and men is heart diseases that leads to more than half of the deaths. heart diseases develop due to narrow arteries, buildup of plaque in blood capillaries that arises difficulties in blood flow.

the second leading cause of deaths in us is cancer that affects individuals of all ages. it develops due to uncontrolled growth and spread of tumor cells, which results in death if the not controlled or treated.

the third leading cause of deaths in us is copd or chronic obstructive pulmonary disease. it includes difficulty in breathing, chest infections, and persistent cough. smocking is a leading cause of copd and around 80% of copd deaths occur due to smoking.

thus, the correct answer is 'option). cancer, copd, and heart disease.'