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Biology U8A

Across
Blood vessel leaving the heart
The wasting away of tissue
Tiny sacs within the lungs which increase the surface available for gas exchange
A transmitter substance from the nervous system that causes muscle contraction
One of the two proteins involved with muscle contraction
A small artery
Male hormone
Down
A substance that stimulates the production of an antibody
A worm-like organ attached to the junction of the small and large bowel
One of the two thin-walled chambers that receive blood into the heart
The valve between the left ventricle and the aorta
Taking in nutrients through the small intestine
A harmless antigen that stimulates an immune response
inflammation of joints
The lower opening of the intestinal tract