Active transport requires energy because it usually involves the movement of
A. substances in the gas phase, such as oxygen and carbon dioxide.
OB. substances from an area of high concentration to an area of low concentration
OC. substances that can easily pass through the cell membrane, such as water.
D. substances from an area of law concentration to an area of high concentration.

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

Define the apical impulse and describe its normal location, size, and duration. which abnormal conditions may affect the location of the apical impulse? explain the mechanism producing normal first and second heart sounds. describe the effect of respiration on the heart sounds. describe the characteristics of the first heart sound and its intensity at the apex of the heart and at the base. describe the characteristics of the second heart sound and its intensity at the apex of the heart and at the base.

The human body needs energy in order to carry out life processes such as breathing. where does the body get this energy? a. from eating food b. from learning about new things c. from lying in the sun d. from sleeping