Solve these clues to fill the grid.
- Organ that pumps blood around the body
- 1 Across
- A ___ in which ___ circulates (plural)
- 5 Across
- A series with a definite pattern of advance
- 7 Across
- Inhaling and exhaling fumes from burning tobacco or other substances.
- 12 Across
- The biological process whereby genetic factors are transmitted from one generation to the next
- 14 Across
- Return to an original state
- 15 Across
- More than average fatness
- 16 Across
- A blood vessel that carries blood from the heart to the body (plural)
- 2 Down
- Any of the minute blood vessels connecting arterioles with venules (plural)
- 3 Down
- The rate at which the heart beats
- 4 Down
- Gas in the air that we need to breathe
- 6 Down
- The quality of being ___ rather than general
- 8 Down
- The magnitude of sound
- 9 Down
- The part of an organism that connects the head to the rest of the body
- 10 Down
- Either of two saclike respiratory organs in the chest of vertebrates (plural)
- 11 Down
- Depending on free oxygen or air
- 13 Down