QUIZ 3 QUESTIONS & ANSWERS

QUIZ 3 QUESTIONS & ANSWERS Question 1 of 32 3.0/ 3.0 Points Which of the following is/are true of the molecule named hemoglobin? • A. It numbers approximately 1 to 2 million in each erythrocyte. • B. It can bind to only one molecule of oxygen. • C. It is a very simple protein structure. • D. It contains four folded chains of a protein named globin. • E. It functions as the nucleus in all mature erythrocytes. Feedback:Good work; your answer is correct! Question 2 of 32 3.0/ 3.0 Points Which of the following is the primary function of red blood cells? • A. To bind some ions and molecules in the blood which are not water-soluble. • B. To bind and carry away waste products from most cells of the body. • C. To help in the process of hemostasis, the stoppage of blood flow following damage to a blood vessel. • D. To help fight off infection as part of the immune system. • E. To carry oxygen from the lungs to all cells of the body; to carry some carbon dioxide from the cells back to the lungs. Feedback:Good work; your answer is correct! Question 3 of 32 3.0/ 3.0 Points Which of the following is/are true of platelets? • A. Platelets are sometimes referred to as thrombocytes. • B. Platelets are actually pieces of large cells called a megakaryocytes. • C. Platelets are very small, but very numerous, sometimes numbering 150,000 to 160,000 per microliter of blood. • D. Platelets are critical to hemostasis, the stoppage of blood flow following damage to a vessel. • E. All of the above are true. Feedback:Good work; your answer is correct! Question 4 of 32 0.0/ 3.0 Points The blood type of a person’s blood depends on which of the following factors? • A. Which of the three antigens, A, B, and/or O, are located on the surface of the erythrocytes. • B. Which of two antigens, Rh+ or Rh-, are located on the surface of the erythrocytes. • C. Which of the two antigens, A or B or both, are located on the surface of the erythrocytes. • D. Whether or not the Rh antigen is found on the surface of the erythrocytes. • E. The blood type depends on both C and D. Feedback:The ABO part of the blood type depends on which of the A and B antigens, or both, or neither, are found on the surface of the erythrocytes. Whether the blood is Rh+ or Rh- depends on whether or not the Rh antigen is present. Question 5 of 32 3.0/ 3.0 Points Which of the following is/are true about the amount of oxygen being carried by RBCs? • A. Percent saturation of oxygen in the blood is normally monitored using a device known as a pulse oximeter. • B. The normal pulse oximeter readings range from 95--100%. • C. Lower pulse oximeter readings, e.g. less than 95%, are indicative of the condition named hypoxemia. • D. Many different diseases or conditions can result in hypoxemia. • E. All of the above are true. Feedback:Good work; your answer is correct! Part 2 of 7 - 12.0/ 15.0 Points Question 6 of 32 3.0/ 3.0 Points One of the most important ways of investigating the function of the heart is called the “cardiac output.” Which of the following facts is/are true? • A. Cardiac output, CO, is determined by multiplying the heart rate, HR, by the amount of blood that is pumped out of the left ventricle with each heart contraction, called “stroke volume” and designated as SV. • B. Is almost impossible to measure. • C. It cannot be measured without using very dangerous and invasive methods. • D. The CO will never change in any one individual. • E. All of the above are true. Feedback:Good work; your answer is correct! Question 7 of 32 3.0/ 3.0 Points By careful placement of surface electrodes on the body, it is possible to record the complex, compound electrical signal of the heart. This tracing of the electrical signal is the electrocardiogram (ECG). Which of the following statements is/are true? • A. A resting ECG usually takes approximately 1-2 hours to be recorded. • B. The ECG is useful for analyzing both normal and abnormal depolarizations of the heart. • C. To record an ECG, 12-electrodes are placed in a circular pattern around the person’s chest. • D. A normal ECG shows one single spike representing the contraction of the entire heart. • E. These electrodes are placed using needles deeply in the skin of the chest. Feedback:Good work; your answer is correct! Question 8 of 32 0.0/ 3.0 Points A cardiac muscle cell is: • A. a voluntary muscle just like skeletal muscle. • B. contracts spontaneously. • C. is joined to other cardiac muscle cells by structures called intercalated discs. • D. has numerous nuclei.