Types of Muscles
Muscle Structure
How Muscles Work
Growth & Changes
Body Systems
100

This type of muscle is attached to bones and allows voluntary movement.

👉 What is skeletal muscle?

100

Another name for muscle cells.

👉 What are muscle fibers (or myocytes)?

100

Muscles work in pairs to create this.

👉 What is movement?

100

Muscle growth from exercise is called this.

👉 What is hypertrophy?

100

Muscles and bones working together are called this system.

👉 What is the musculoskeletal system?

200

This muscle type is found in the heart.

👉 What is cardiac muscle?

200

The energy source muscles use to contract.
 

👉 What is ATP?

200

Skeletal muscles help maintain this and keep you upright.

👉 What is posture?

200

Muscle shrinking due to lack of use is called this.

👉 What is atrophy?

200

Muscles are attached to bones by these.

👉 What are tendons?

300

This muscle type controls organs like the stomach and intestines.

👉 What is smooth muscle?

300

Muscle cells shorten during this process.

👉 What is contraction?

300

Wave-like contractions that move food through the digestive system.

👉 What is peristalsis?

300

Loss of muscle mass due to aging.

👉 What is sarcopenia?

300

This system provides the structure muscles pull on.

👉 What is the skeletal system?

400

This type of muscle works without you thinking about it.

👉 What is involuntary muscle?

400

Protein filaments do this to cause contraction.

👉 What is slide past each other?

400

This system sends signals to muscles to contract.

👉 What is the nervous system?

400

Muscle size determines this.

👉 What is strength?

400

Motor neurons are part of this system.

👉 What is the nervous system?

500

These two muscle types are involuntary.

👉 What are smooth and cardiac muscles?

500

The connection point between a motor neuron and a muscle.

👉 What is the neuromuscular junction?

500

This hormone increases heart rate during stress.

👉 What is adrenaline?

500

During hypertrophy and atrophy, this stays the same.

👉 What is the number of muscle fibers?

500

This system moves blood when the heart contracts.

👉 What is the cardiovascular system?