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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.
The sinus venosus receives unoxygenated blood from the body. A valve at the end of the sinus venosus opens into the atrium. b. The atrium has thick, muscular walls. The atrium receives unoxygenated blood and pumps it into the ventricle. c. The ventricle is the largest and most muscular chamber of the heart. valve at the end of the sinus venosus opens into the atrium. b. The atrium has thick, muscular walls. The atrium receives unoxygenated blood and pumps it into the ventricle. c. The ventricle is the largest and most muscular chamber of the heart.