Which of the following represents a class I lever system

Chapter 10 Muscular System: Gross Anatomy________________________________________ 1. The sternocleidomastoid muscle extends from the mastoid process of the temporal bone to the sternum and medial clavicle. When both sternocleidomastoid muscles contract, the head is flexed. The end of the muscle that connects to the sternum is the a. origin. b. belly. c. body. d. insertion. e. fixator. 2. Which of the following represents a class I lever system? a. crossing your legs b. hyperextension of the head c. standing on your tiptoes d. flexion of the elbow to elevate the hand e. lifting weight with your arm 3. In order to stabilize the hyoid so that the larynx can be elevated in swallowing, the _____ muscle group is used. a. Pterygoid b. Infrahyoid c. Auricularis d. Suprahyoid e. Hyoglossus 4. If abdominal muscles are contracted while the vertebral column is fixed this will aid in a. vomiting. b. childbirth. c. urination. d. defecation. e. All of these choices are correct. 5. Which muscle will depress the scapula or elevate the ribs? a. levator scapulae b. serratus anterior c. pectoralis minor d. subclavius e. rhomboideus major 6. Which of the following muscles extends the forearm and has its insertion on the ulna? a. Deltoid b. biceps brachii c. triceps brachii d. Brachialis e. Coracobrachialis 7. The gluteus maximus a. does most of the work in “sit-ups.” b. accounts for a sprinter’s stance. c. allows one to sit cross-legged. d. is used in the knee-jerk reflex. e. is a common site for injections. 8. Label muscle “A” on the diagram. a. orbicularis oculi b. temporalis c. Trapezius d. Sternocleidomastoid e. masseter 9. Label muscle “A” on the diagram. a. linea alba b. serratus anterior c. rectus abdominis d. external oblique e. internal oblique 10. What does “A” represent? a. Coracobrachialis b. Deltoid c. pectoralis major d. biceps brachii e. serratus anterior