H-words

Question 1

hematocrit

Answer 1

percentage of total blood volume occupied by (mostly red) blood cells, in humans it is normally between 40-50%

Question 2

homeostasis

Answer 2

ability of a system or living organism to adjust its internal environment to maintain a state of dynamic constancy; such as the ability of warm-blooded animals to maintain a stable temperature

Question 3

hydration

Answer 3

when water molecules surround polar molecules and ions shielding off their charges and ensuring that they remain in the solution

Question 4

hydrogen-bond

Answer 4

weak interaction between an H-atom bound to a highly electronegative atom (O, N) in a molecule, and another highly electronegative atom (O, N), in the same or a different molecule

Question 5

hydrophilic (lipophobic)

Answer 5

polar or charged molecule that is able to interact with water molecules, thus can be dissolved in water

Question 6

hydrophobic (lipophilic)

Answer 6

nonpolar molecule that is unable to interact with water molecules, thus insoluble in water

Question 7

hypernea/hyperventilation

Answer 7

increased lung ventilation

Question 8

hyperpolarization

Answer 8

toward the end of an action potential when the environment within the cell goes below (more negative) than the resting state value, but quickly stabilizes

Question 9

hypopolarization

Answer 9

a shift of the resting membrane potential toward less negative values – a decrease