Plasma Concentration of Calcium lons in Experimental Animals I Animal injected with calcium after having thyroid and parathyroid removed II Normal animal injected with calcium III Normal animal injected with agent that removes calcium from the blood The injections were given at time =0h. The results obtained from the animal labelled II indicate that calcium was used as an energy source in muscle contraction deposited into the bones of the skeletal system. absorbed more readily in the small intestine. reabsorbed in the nephrons of the kidneys.