Answer: The human circulatory system has a complex network of blood vessels that reach all parts of the body. This extensive network supplies the cells, tissues, and organs with oxygen and nutrients, and removes carbon dioxide and waste compounds.
Explanation:
You can help to prevent muscle mass loss as you age by maintaining a regular exercise program.
Answer: B. Maintain a regular exercise program.
Answer: The automatic response to tensing your muscles after you hear the sound of the clanking the rollercoaster makes is an example of the phrase pavlov's dogs, which can refer to classical conditioning because it refers to the habit of automatic response to a stimulus.
Phagocytes are known as "cell eaters" because they engulf particles and bacteria that enter the body that might harm it.