Which of the following characteristics of skeletal muscle would be most helpful

Question

Which of the following characteristics of skeletal muscle would be most helpful when attempting to differentiate it from other muscle types using microscopy? 6. a. Multiple (>3) nuclei b. Striations c. Fusiform shape d. Voluntary control e. Branching 7. A patient is rushed to the emergency department with a right chest wall wound with resultant hemopneumothroax, which is air and blood in the chest cavity. The air and blood fill a potential space separating which two surfaces around the right lung? a. Internal and external mucous membranes b. Superficial and deep synovial membranes c. Parietal and visceral serous membranes d. Superficial and deep cutaneous membranes e. Epithelium and connective tissue During embryonic development a trilaminar disc forms producing three primary germ layers. One of the layers, the endoderm, forms which of the following organs? 8. a. Pituitary gland b. Adrenal cortex c. Adrenal medula d. Thyroid gland e. Lens of eye 9. Stem cells are currently being investigated for a multitude of medical purposes. Harvesting of stem cells capable of differentiation into any tissue type would come from which of the following? a. Blastocyst b. Epithelium c Zygote after two cell divisions d. Bone marrow e Secondary cocyte 10. The respiratory tract is normally lined by cililated pseudostratified epithelium. Chronic smoking can change this epithelium into nonkeratinized stratifiled squamous epithelium. What kind of tissue modification does this describe? a. Dysplasia b. Metaplasia c. Neoplasia d. Hypertrophy e. Atrophy

Explanation / Answer

6. Ans- b. striations

Explanation:

In skeletal muscles, alternate light and dark bands called striations are found that help in differentiating from other types of muscle tissues.

7. Ans- c. parietal and visceral serous membrane

Explanation:

The parietal pleura covers the wall of the chest whereas the visceral membrane covers the outside of the lungs. During hemopneumothorax, the air and blood fill a potential space separating the visceral and parietal serous membrane from the right lung.

8. Ans-d. thyroid gland

Explanation:

The organs formed by an endoderm include the stomach, the colon, the liver, the pancreas, the urinary bladder, the trachea, the lungs, the pharynx, the thyroid gland, the parathyroid gland, and the intestines.

9. Ans-d. bone marrow

Explanation:

Harvesting of stem cells capable of differentiation into any tissue type that comes from - bone marrow, adipose tissue(fat cells), and blood. Blastocyst can form any tissue except the placenta and umbilical cord.

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