Term Exam 2: Breathing Muscles of the Thorax

Question 1

How do respiratory muscles assist in breathing?

Answer 1

Respiratory muscles alter the size of the thoracic cavity.

-This affects the pressure in the lungs that determines whether we inhale or exhale

Question 2

What are eleven important respiratory muscles?

Answer 2

1. Diaphragm
2. external intercostal muscles
3. internal intercostal muscles
4. sternocleimastoid
5. scalene
6. pectoralis minor
7. external obliques
8. internal obliques
9. transverse abdominis
10. rectus abdominis
11. internal intercostals

Question 3

Which 3 muscles are included in forced inhalation?

Answer 3

1. sternocleimastoid
2. scalene
3. pectoralis minor

Question 4

Which five muscles are active in forceful exhalation?

Answer 4

1. External obliques
2. internal obliques
3. transverse abdominis
4. rectus abdominis
5. internal intercostals

Question 5

Label the Muscles of the Thoracic Cavity:

• Clavicle
• Ribs
• Internal Intercostals
• External intercostals
• Innermost intercostals
• sternum
• central tendon
• diaphragm
• pectoralis minor
• ribs
• external oblique
• rectus abdominis
• transversus abdominis and aponeurosis
• linea alba
• transversus abdominis
• internal oblique
• spermatic cord
• pubic tubercle
• pubic symphysis
• anterior superior iliac spine
• aponeurosis of internal oblique
• inguinal ligament
• iliac crest
• sacrum

Answer 5