Which list is an organ system? (1 point)

COURSE TOOLS
• the heart, arteries, and veins
• the liver, blood, and skin
• the heart, the stomach, and intestines
• the liver, the bladder, and the heart

The list that is an organ system is: the heart, arteries, and veins.

The correct answer is:

• the heart, arteries, and veins.

This is because the heart, arteries, and veins together make up the cardiovascular system, which is an organ system responsible for the circulation of blood throughout the body.

To identify which list is an organ system, we need to understand what an organ system is. An organ system is a group of organs that work together to perform a specific function in the body.

Looking at the options given:
1. COURSE TOOLS: This does not represent an organ system. It appears to be irrelevant to the human body.
2. The heart, arteries, and veins: This represents the cardiovascular system. The heart pumps blood through the arteries and veins, which transport oxygen and nutrients to the body's cells.
3. The liver, blood, and skin: This combination of organs does not represent a specific organ system. While the liver and skin are part of different systems (digestive and integumentary respectively), blood is present throughout the body.
4. The heart, stomach, and intestines: This combination represents the digestive system. The stomach and intestines help break down food, while the heart pumps blood to facilitate the transportation of nutrients.
5. The liver, bladder, and heart: This combination does not represent a specific organ system. While the liver and heart are part of different systems (digestive and cardiovascular respectively), the bladder is part of the urinary system.

Based on the explanations provided, the correct answer is option 2: the heart, arteries, and veins, representing the cardiovascular system.