U3L4 Flashcard Review

Front

What are the quadriceps?

Back

The quadriceps are a group of four muscles located at the front of the thigh, responsible for extending the knee.

Front

What is the primary function of the quadriceps?

Back

The quadriceps primarily flex the hip and extend the knee, allowing for movements such as walking, running, and jumping.

Front

Identify the gastrocnemius muscle.

Back

The gastrocnemius is a large muscle located at the back of the lower leg, responsible for plantar flexing the foot and flexing the knee.

Front

What is the role of lactic acid in muscle contractions?

Back

Lactic acid is produced during anaerobic respiration and can lead to muscle fatigue; an increase in lactic acid correlates with a decrease in ATP and muscle contraction efficiency.

Front

What are the pectoral muscles?

Back

The pectoral muscles, or pectoralis major and minor, are located in the chest and are responsible for movements of the shoulder joint.

Front

How many muscles are in the quadriceps group?

Back

There are four muscles in the quadriceps group.

Front

What is the relationship between ATP and muscle contractions?

Back

ATP (adenosine triphosphate) provides the energy required for muscle contractions; a decrease in ATP leads to reduced muscle performance.

Front

What is the function of the hamstrings?

Back

The hamstrings are a group of three muscles located at the back of the thigh, responsible for flexing the knee and extending the hip.

Front

What is the role of the tibialis anterior muscle?

Back

The tibialis anterior is located in the front of the lower leg and is responsible for dorsiflexing the foot.

Front

What happens to muscle contractions when lactic acid levels increase?

Back

When lactic acid levels increase, muscle contractions typically decrease due to fatigue.