30)The anterior muscle that inserts widely on the periosteum of the mandible is

Question

30)The anterior muscle that inserts widely on the periosteum of the mandible is the A) temporalis B) medial pterygoideus. C) masseter. D) platysma E) lateral pterygoideus. 31) Which of the following is the insertion of the pectoralis major? A) the mastoid region of the skull B) the occipital bone of the skull C) the clavicle and scapula D) the vertebral border near the spine E) the greater tubercle of the humerus 32) An antagonist to the gastrocnemius is the A) tibialis anterior. B) peroneus. C) soleus. D) tibialis posterior. E) extensor digitorum longus 33) Which of the following muscles has its origin on the hyoid and inserts on the tongue? 33) A) lateral pterygoideus C) stemohyoid D) thyrohyoid E) geniohyoid 34) Which of the following best describes the term sarcomere? 34) A) largely made of myosin molecules B) repeating unit of striated myofibrils C) storage site for calcium ions D) thin filaments are anchored here E) protein that accounts for elasticity of resting muscle 35) When comparing slow motor units to fast motor units, slow units 35) A) take about three times as long to reach peak tension. B) are rich in the red protein myoglobin. C) generate much less tension. D) have much smaller fiber diameters. E) all of the above 36) Which of the following statements is false? 36) A) Skeletal muscle stimulation is neural. B) Skeletal muscle contractions may be summated C) Cardiac muscle contractions cannot be summated D) Cardiocytes are interconnected through intercalated dises. E) Cardiac muscle stimulation is neural.

Explanation / Answer

30. Platysma is the anterior muscle that inserts widely on the periosteum of the mandible. It is a long quadrangular muscle which contracts and pulls the corners of the mouth down, wrinkles the neck laterally and raises the skin of the chest.

31. Insertion of pectoralis major includes Clavicular head and Sternal head.

Clavicular Head: anterior lip of the deltoid tuberosity and Lateral lip of the bicipital groove of the humerus.
Sternal Head: anterior lip of the deltoid tuberosity and the Lateral lip of the bicipital groove of the humerus

32. The Primary actions of Tibialis anterior include

Dorsiflexion of the foot at the ankle for which Antagonists are gastrocnemius and soleus.

Inversion of the foot at subtalar joint for which antagonists are Peroneus Longus, Peroneus Brevis.

33. Hypoglossus, the quadrilateral - shaped muscle originates on the greater horn of the hyoid bone and then it inserts onto the lateral surface of the tongue.It depresses the tongue.

34. Sarcomere can be considered best for repeating unit of striated myofibrils. It is the basic unit for both striated and cardiac muscle and is made up of a complex mesh of thick filaments, thin filaments, and a giant protein titin.

35. Slow motor units are rich in myoglobin protein, generate much less tension, take about three times as long to reach peak tension, have much smaller fibre diameters. So the answer would be all of the above.

36. Cardiac muscle simulation is not neural, it is due to pacemaker

Related Questions

Navigate

• Browse (All)
• Browse 3
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.