Final answer:
Epithelial tissue is involved in releasing sweat and saliva, nervous tissue regulates the heart's rhythm, and cardiac tissue contracts to pump blood in a dog's heart
Step-by-step explanation:
The three sentences that describe different tissues in a dog's heart working together for the dog's survival are:
Epithelial tissue releases sweat and saliva. Although this is an important tissue for the overall function of the dog's body, it does not directly contribute to the heart's functioning.
Nervous tissue sends signals to set the rhythm of contractions. This is a crucial role for the functioning of the heart, as the nervous tissue regulates the heartbeat.
Cardiac tissue contracts to pump blood. This is the main tissue responsible for the heart's functioning, as it contracts to pump blood throughout the dog's body.