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Crossword clues

Solve these clues to fill the grid.

Organ that pumps blood around the body
1 Across
A heavy odorless colorless gas formed during respiration and by the decomposition of organic
3 Across
The metabolic processes whereby certain organisms obtain energy from organic molecules
5 Across
The power to do work or make things move
8 Across
Tiniest unit of living things (plural)
10 Across
Gas in the air that we need to breathe
11 Across
A mature ___ ___ that contains hemoglobin to carry oxygen to the bodily tissues (plural)
2 Down
The bodily process of inhalation and exhalation
4 Down
Physical activity that keeps you fit
6 Down
Either of two saclike respiratory organs in the chest of vertebrates (plural)
7 Down
Red liquid pumped around the body by the heart
9 Down

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