98. The respiratory membrane/zone is made of the wall of the alveolus and the wa

Question

98. The respiratory membrane/zone is made of the wall of the alveolus and the wall of a capil a. True b. False this decreases intrapleural pressure, and causes air to rush in, expanding the lungs 100. Parasympathetic stimulation and histamine both result in bronchiole constriction 101. The type of blood vessel that plays a key role in adjusting blood pressure is the 99. When the diaphragm and intercostals muscles contract, the volume of the thoracic cavity inc a. True b. False a. True b. False a. capillary b. vein c. venule d. arteriole 102. Materials can cross the capillary walls by b. Openings in the endothelial cells (fenestrations) c. Through intercellular clefts d. Directly through the endothelial cell membranes e. All of the above 103. The velocity of blood flow in blood vessels is inversely related to Cross sectional area of blood vessels a. b. Diastolic blood pressure c. Distance from the heart d. Volume of blood being conducted The alternate expansion and elastic recoil of an artery wall with each heart beat a. Is the blood pressure b. Occurs approximately 75 times per minute c. Is the end systolic blood volume d. Is a function of the pacemaker 104· The fetus derives its oxygen and nutrients and eliminates its carbon dioxide and wastes through a. Ductus arteriosus b. Ligamentum arteriosum c. Umbilical artery d. Placenta 105. The foramen ovale in the fetal heart a. Becomes the tricuspid valve in the adult b. Bypasses most of the pulmonary circulation c. Bypasses most of the systemic circulation d. Is a birth defect 106. PE 14

Explanation / Answer

98) TRUE

The respiratory membrane consists of four tissue layers:
1. alveolar wall (type 1 and type 11 aveolar cells and alveolar macrophages
2. epithelial basement membrane-under the aveolar wall
3. Capillary basement membrane-fused to the epithelial basement membrane

4. Capillary epithelium

This membrane will help in the respiratory gases exchange like O2 and CO2 between the lungs and blood. This causes diffusion across the alveolar and capillary walls. Collectively, these layers are called the alveolar-capillary (respiratory) membrane.
99) TRUE

Diaphragm, the contraction of which enlarges the chest cavity vertically. Intercostal muscles when contract produce elevation or ribs and sternum. this enlarges the chest cavity in all the other 4 sides. the lungs expand at this stage and filled this increased space. Now the pressure in the lungs is less than atmospheric pressure. so air flows into the lungs

100) TRUE

yes this two are called as bronchoconstriction

101) veins. As air pressure within the thorax drops, blood pressure in the thoracic veins also decreases, falling below the pressure in the abdominal veins

102) D capillaries are one celled memberanes so the transfer of materials will be taken place directly through the endothelial membrane

103) A Blood flows in the same direction as the decreasing pressure gradient: arteries tocapillaries to veins. The rate, or velocity, of blood flow varies inversely with the total cross-sectional area of the blood vessels

104)B pulse or the surface and heartbeat will causes it

105) From the mother to the fetus, the placenta transfers nutrients and oxygen. From the fetus, waste products are transferred to the mother

106) which allows blood that still escapes to the right ventricle to bypass the pulmonary circulation

Related Questions

Navigate

• Browse (All)
• Browse 9
• Subjects

---

---

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