- How the heart beats: the ___ fill with blood. The ___ contract, filling the ____ with blood. The ___ sends signals that cause both ____ to contract. The signal travels to another area in the heart called the _____, causing both ventricles to contract
- The most abundant amount of blood vessels in our body are ____
- The heart is divided into _ compartments called ____
- The right and left ventricles pump blood __ the heart
- Veins are the color ___. This means that they are ____ rich and ____ poor
- The circulatory system transports ___ to deliver important substances, such as oxygen, and removes ____, such as carbon dioxide
- The circulatory system carries disease fighting materials produces by the
- Fast twitch muscles rely on _____, which causes a buildup of lactic acid
- Slow twitch muscle fibers have more _____ than fast twitch muscle fibers
- Cellular respiration provides ____ for energy
- Cardiac muscles are arranged in a ___ that allows the heart muscle to contract efficiently and rhythmically
- Sarcomeres are ____ of muscle and the part of the muscle that ____
- Myofibrils are arranged in sections called
- Skeletal muscle is arranged into ____, which consist of many smaller units called _____
- During exercise, _____ builds up in muscle cells, causing fatigue
- Which two types of muscle are striated and which one isn't
- What is the largest structure of the brain
- The minimum stimulus to cause an action potential to be produced is a ____
- An action potential is carried across synapses gaps by ____
- What are two key points about the effects of the nervous system?