Muscle Groups And Joint Actions Study Guide
Leg Exercises Lowering into a squat requires your knees and hips to flex and your ankles to dorsiflex. As you stand up, your knees and hips extend and your ankles plantar flex. The primary muscles you're working are your quadriceps, which extend the knee.
Squats also target the gluteus maximus and hamstrings, which extend the hip, as well as the gastrocnemius and soleus, which plantarflex the ankles. A deadlift employs similar joint actions to a squat, but with less hip and knee flexion. In a deadlift, the muscular emphasis is on the hip extensors, especially the gluteus maximus and the hamstrings. In both squats and deadlifts, the erector spinae muscles of your back work isometrically to stabilize your spine. Upper Body Pushing Exercises During a bench press your shoulder joints adduct and your elbows extend to press the bar upward.
Hip Joint Actions
You primarily use the pectoralis major muscles of your chest, the anterior deltoid muscles of your shoulder, and the triceps muscles on the back of your arms. Shoulder presses require shoulder flexion and elbow extension to lift the weight overhead. Nc9ex ii manual. The anterior deltoids and triceps are the principle muscles involved. In addition, your trapezius and serratus anterior muscles upwardly rotate your shoulder blades during a shoulder press to allow your arms to reach overhead. Upper Body Pulling Exercises To perform a pullup, your shoulder joints must adduct and extend while your elbows flex.
Muscle Groups And Joint Actions Study Guide Answers
The latissimus dorsi pull your arms down, while the biceps brachii and brachialis muscles are responsible for bending your elbows. In rowing exercises, such as seated cable rows or bent-over rows, your shoulder joints extend as your elbows flex. Your latissimus dorsi muscles pull your arms back, and your biceps brachii and brachialis muscles flex your elbows. In addition, the rhomboids of your upper back work to adduct your shoulder blades.