Smooth muscle
- Involuntary muscle, they work without trying.
- Smooth muscles are located in stomach, intestine and bladder.

Cardiac muscle
- Involuntary muscle
- The heart (myocardian)
- Contracts and relaxes to pumped blood for your body.

Skeletal muscle
- Voluntary muscles, decides when and how to move them.

Cardiac & smooth muscles= involuntary

When your processing your experiment, there are various ways to record your observation. Writing it down, video taping, voice recording and taking photos would be great for observations. However, if you are careless and make mistakes when your recording your observations. The whole experiment could all be ruined due to the wrong observations. Therefore, recording the correct observations are crucial when while experimenting.

Your heart rate, or pulse, refers to how many times your heart contracts and relaxes per minute - how many beats there are per minute. Heart rate is how many times the heart beats in a unit of time, nearly always per minute. The number of contractions of the lower chambers of the heart. Yet, pulse rate is the blood gushes through the artery from a heart beat, it creates a bulge in the artery. The rate at which the artery bulges that can be measured by touching it with your fingers, as on the wrist or neck. Your heart rate will increase if you do exercise.

Hypothesis is an educational guess that you make before you start the experiment. A good hypothesis must be like the following sentence. "If _____[I do this] _____, then _____[this]_____ will happen." Like this, a good hypothesis should use simple language, make sure it's testable and defined variables. Having a testable hypothesis means that it had identified variables and included independent and dependent variables.

1. Breathing rate increases to ensure more air inside the lungs and so more oxygen
2. Heart rate increases to ensure more blood is available to all working muscles and other tissues; this helps in getting more oxygen and more nutrients for energy.

Oxygen debt occurs when your intake of oxygen isn't as high as the rate you are using the oxygen. This often occurs in sport and is caused by Anaerobic Respiration.

Oxygen plays a vital role in the breathing processes and in the metabolism of the living organisms.

Breathing is a physical process and respiration is a chemical process. Breathing is a process of taking oxygen into the lungs while respiration is taking the oxygen from the lungs into the blood stream or to the cells.