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The gastrocnemius inserts at the calcaneous bone of the heel of the foot by way of the Achilles tendon. Achilles Tendon. Muscles insert to bone through their tendons. Muscle bundles are surrounded by filmy connective tissues. These connective tissues extend from the muscle and gather to form tendons. Tendons are denser and more fibrous than muscle.
Blood enters the heart through the sinus venosus which drains into the atrium. The posterior cardinal sinuses receive blood from the posterior parts of the body and drain through the common cardinal veins into the sinus venosus.lood enters the heart through the sinus venosus which drains into the atrium. The posterior cardinal sinuses receive blood from the posterior parts of the body and drain through the common cardinal veins into the sinus venosus.