1. T F When RBC are broken down, the Hb is recycled intact into a new RBC. 2. T

Question

1. T   F   When RBC are broken down, the Hb is recycled intact into a new RBC.

2. T   F   The vena cava returns blood to the left atrium.

3. T   F   Cardiac muscle fibers are electrically coupled at intercalated disks.

4. T   F   Fast glycolytic skeletal muscle fibers fatigue very rapidly and are found in leg muscles of chickens.

5. T   F Cutting the vagus increases the rate of spontaneous depolarization in pacemaker cells

6. T   F   Red blood cells normally make up about 30 - 50% of all blood cells.

Explanation / Answer

1) When RBCs are broken down, the heme in haemoglobin is converted into biliverdin and then into bilirubin to be excreted as bile into the gastrointestinal tract. Through enterohepatic circulation, some of the bile are absorbed back and the iron content is again recycled back into haemoglobin. So, thus statement is true.

2) The Vena cava returns blood to right atrium. So, this statement is false.

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