PPT-Muscles

The Sliding Filament Hypothesis suggests muscular contraction occurs in the sarcomeres of the muscle fibres Explain how actin and myosin filaments in the sarcomere bind together causing muscular contraction 4 marks. More than 600 muscles in our bodies (about 650). Muscles make up approximately half of the human body’s weight. The human heart will beat . about 40 million times a year. , and . a person's heart will beat approximately 2.5 billion times by the time of their 70th birthday.. * move the forearm (elbow) . 1. . biceps . brachii. * L: anterior upper arm. * A: flexes elbow, . supinates. hand . 2. . brachialis. * L: medial upper arm. * A: flexes elbow. 3. . triceps . Human Body. Frontalis. – Elevates eyebrow. Orbicularis. . oculi. – Flexes eye. Zygomaticus. – Elevates lips. Orbicularis. . oris. – Flexes lips. Masseter. – Elevates mandible. Muscles of the Head/Face. Interesting Muscle Facts. Thirty facial muscles create looks like surprise, happiness, sadness, and frowning. Eye muscles are the busiest muscles in the body. Scientists estimate they may move more than 100,000 times a day. The . sliding . filament theory . of . muscle contraction. Gross . and microscopic structure of skeletal muscle. The . ultrastructure. of a myofibril.. The . roles of . actin. , myosin, calcium ions and ATP in myofibril contraction.. Objective. : . To learn the structure and function of the Muscular System. Bell Work. : . Muscles need lots of energy to complete their job. Which organelle do you think is most abundant inside muscle cells?. Muscle. Origin. Insertion. Action. *Rectus . Abdominis. Pubis. Ribs, . Xyphoid. Process. Flexes. and rotates lumbar vertebrae. *External . Oblique. Ribs. Pubis, Ilium, Linea Alba. Flexes vertebral column. RECEPTORS AND EFFECTORS. SENSORY RECEPTORS. receptor. stimuli. sense. Photoreceptors. light. Eyes. Mechanoreceptors. Changes. in . movement. , . pressure. , . waves. , . sound. ,. . contact. , . pain. Objectives. Identify tender, intermediate, and tough muscles. List specific muscles in various steaks. What steaks are the most tender?. Tender Muscles. Examples:. Psoas major-. . Loin, on the back. Objectives. Identify tender, intermediate, and tough muscles. List specific muscles in various steaks. What steaks are the most tender?. Tender Muscles. Examples:. Psoas major-. . Loin, on the back. Muscles of Swallowing. Muscles of Swallowing. The anterior portion of the neck is divided into the suprahyoid and infrahyoid muscle groups.. . Muscles of Swallowing. The anterior portion of the neck is divided into the suprahyoid and infrahyoid muscle groups.. masticatory. apparatus, including the skeletal components, the teeth and the . temporo-mandibular. joint.. The . masseter. muscle. The . masseter. muscle is a broad . multipemnnate. (bilateral symmetrical) muscle with . 1. Sartorius. 2. . Gracilis. 3. Adductor . magnus. 4. Adductor . longus. Hip. Foot. Anterior Cadaver . Thigh Muscles. 1. Sartorius. 2. Rectus . femoris. 3. . Vastus. . lateralis. 4. . Vastus. . medialis. Anterior and Posterior Trunk Muscles. Arm and Shoulder Muscles. 207-209. Table 6.3 Superficial Anterior Muscles of the Body (See Figure 6.22) (2 of 3).. Figure 6.17a . Muscles of the anterior trunk, shoulder, and arm..