Question

which of the following are parts of the circulatory system? choose one option a blood, lungs, lymph nodes b kidneys, blood vessels, esophagus c blood, blood vessels, heart d skin, heart, bones

Explanation:

The circulatory system's core components are the heart (pump), blood vessels (transport pathways), and blood (transport medium). Option A includes lungs (respiratory) and lymph nodes (lymphatic, not circulatory). Option B has kidneys (excretory) and esophagus (digestive). Option D has skin (integumentary) and bones (skeletal). Only option C lists all circulatory parts.

Answer:

C. blood, blood vessels, heart