How are red blood cells able to move through narrow vessels to carry oxygen throughout a multicellular organism
Red blood cells are able to move through narrow vessels to carry oxygen throughout a multicellular organism because of their unique shape and flexibility. Red blood cells are biconcave discs, which means they are thin in the middle and thicker at the edges. This allows them to deform and squeeze through small capillaries and other narrow passages in the body.
Additionally, red blood cells do not have a nucleus or other organelles, which gives them more space to carry oxygen molecules. This lack of organelles also allows red blood cells to be more flexible and maneuverable as they travel through the circulatory system.
Finally, red blood cells are constantly moving through the body in a cyclical motion, propelled by the pumping action of the heart. This constant movement helps to push the red blood cells through narrow vessels and ensure that oxygen is delivered to all tissues and organs throughout the body.