Question

which organ system provides oxygen so that exercising muscle fibers can efficiently produce atp?
respiratory
cardiovascular
integumentary
both respiratory and cardiovascular

Explanation:

The respiratory system takes in oxygen from the environment. The cardiovascular system then transports this oxygen to the exercising muscle fibers. Both systems work together to ensure that muscle fibers have the oxygen needed for efficient ATP production (through aerobic respiration). The integumentary system (skin - related functions like protection, temperature regulation etc.) is not involved in oxygen supply for muscle ATP production.

Answer:

both respiratory and cardiovascular