Hello, HanieManuelym!
Heart muscle receives its oxygen and nutrient supply from pulmonary veins.
The "cushion" between bones in joints is cartilage.
Muscle spindles sense contraction levels.
Valves in the circulatory system prevent backwards flow of blood.
A double circulatory system is important for fast metabolism.
The spleen filters blood.
Cardiac muscle is connected by connective tissue.
The respiratory surface must exchange oxygen and CO2 with the environment.
Nervous system input increases the strength, rate, and duration of heartbeat
Fluid within tissues is interstitial.
Hope this helps :)
