We kind of have instincts. When we behave without thinking, such as blinking our eyes when a fast moving object approaches, or grabbing something when losing our balance. These are not involuntary muscles, like a heart pumping, but involuntary behavior. It is a healthy...
See an octopus open a jar from the inside. Watch an Octopus change color and shape while moving like a poisonous snake. With rectangular pupils, jet propulsion and 200 suctions cups per arm that can all taste and feel, you need to check this out.
What you hear affects your emotions. Whether it is what someone is saying to you, a song that is happy or sad, an annoying dog, hearing others arguing or the sound of tree leaves rustling in a gentle breeze. Life would be extremely different without being able to hear.
Muscles provide a beautiful allegory for life and character. There is something spiritual that develops in a person's character when choosing to learn and grow, harvesting beauty from ashes rather than seething in bitterness.