Which reaction releases enzymes such as hyaluronidase and acrosin that allow sperm to penetrate the corona radiata of the secondary oocyte?
A) capacitation B) acrosomal reaction C) cortical reaction D) sperm migration
Answer: B
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Which of the following is not true of the SA node?
A) It is located at the junction of the superior vena cava and right atrium near the superior end of the sulcus terminalis. B) It is the pacemaker of the heart. C) It sends impulses directly to the interventricular bundle of subendocardial branches (fibers). D) It receives sympathetic impulses from the first five to six thoracic segments that accelerate its basal rate. E) It receives parasympathetic impulses from the vagus nerve that decrease its basal rate.
Within a neuromuscular junction, the axon terminal splits into multiple fine branches, each of which ends in an enlarged knoblike structure called the terminal button
a. True b. False Indicate whether the statement is true or false
How are nephrons, collecting ducts, and collecting tubules related to each other?
A. One collecting duct drains into one nephron, and one nephron drains into one collecting tubule. B. One nephron drains into one collecting tubule, and several collecting tubules empty into a collecting duct. C. One nephron drains into one collecting duct, and several collecting ducts empty into a collecting tubule. D. One nephron drains into several collecting tubules, and all tubules eventually lead to one collecting duct. E. One collecting tubule drains into one nephron, and several nephrons drain into one collecting duct.
Answer the following statements true (T) or false (F)
1. During inspiration, the diaphragm contracts and moves up into the thoracic cavity. 2. During inspiration, the size of the chest cavity enlarges. 3. If atmospheric pressure is 760 mm Hg, the pressure inside the chest cavity must be below 760 mm Hg for inspiration to occur. 4. Quiet expiration requires the work of both the intercostal muscles and the abdominal muscles. 5. In some lung diseases, the lungs lose their elasticity and their ability to recoil. This would have the greatest impact on expiration.