Worksheet Chapter 10: Transport in Humans and Animals

1. Which enzyme converts insoluble fibrinogen into insoluble fibrin threads during blood clot formation?

2. Fill in the blank: The natural pacemaker of the heart located in the wall of the right atrium is the ________ node.

3. Explain how interstitial (tissue) fluid is formed at the arterial end of a blood capillary.

4. State two differences between the structural characteristics of an Artery and a Vein.

5. Describe the sequence of electrical excitation events in the human heart that lead to ventricular contraction.

6. True or False: The right lymphatic duct drains lymph from the entire lower half of the human body into the right subclavian vein.

7. True or False: Red blood cells and large plasma proteins are able to pass easily through blood capillary walls to form part of the lymph.

8. A patient suffers from edema in their legs caused by a localized blockage in their lymphatic vessels. Explain why lymphatic obstruction leads to tissue swelling.

9. Explain the step-by-step blood clotting process starting from tissue injury up to the formation of a stable fibrin clot.

10. Compare the double circulatory system of an Amphibian with the double circulatory system of a Human.