Answer:
Option A, They contain a thick tunica media
Explanation:
Artery consist of tunics which is made up of three distinct layers
a) The internal layer is tunica intima – made up of epithelial and connective tissue layers
b) The middle layer is tunica media - thickest layer in arteries and consists of layers of smooth muscle supported by connective tissue
c) The external layer is tunica externa - sheath of connective tissue composed primarily of collagenous fibers
Mature mammalian red blood cells lack nuclei, mitochondria and rough endoplasmic reticulum, they do not contain DNA and consequently, cannot divide. They also cannot synthesise RNA nor synthesise any new proteins, and consequently, have a limited lifespan. Mature red blood cells circulate for about 100–120 days in the body before they are removed by the spleen.
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D) Critical thinking. You thought about what both things said, and thought about which one that you thought was right. Hope this helps. Please mark brainliest. Have an amazing night.
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Answer:
The Respiratory system allows the entry of oxygen into the body and releases Carbon Dioxide. The Oxygen travels across lung tissue into blood vessels and the blood carries the oxygen around the body. Thus the Respiratory and Circulatory systems work together in gas exchange which is vital in Homeostasis.
