Each chamber of the heart has a particular role in maintaining cellular oxygenation. which chamber is responsible for pumping blood to all the cells and tissues of the body?

Left ventricle

Explanation:

Left ventricle forms the thickest chamber of the heart and receives oxygenated blood from the right atrium. The oxygenated blood from the left ventricle is passed through the aortic valve into the ascending aorta. The blood from ascending aorta passes to coronary arteries, arch of the aorta and descending aorta. Branches of the arch of the aorta and descending aorta deliver the oxygenated blood to the various cells and tissues present in body parts.

parasites can detrimentally affect their host, but also must not allow their host to die before they can complete their life cycle. some parasites have complex life cycles with many different hosts, and have had to find ways of persisting in many different environments during the change from one host to another. ectoparasites live outside the body of the host, and can more easily  disperse, but are  more exposed to predators, parasites, parasitoids. endoparasites live inside the body of the host, and are therefore protected from the outside environment. but they can be  attacked by the host's immune system. they have therefore developed  mechanisms for dispersal such as  complex life cycles.