10 Jun BIO 013 – Cells that have lots of tight junctions must have which
Question
1. Cells that have lots of tight junctions must have which of the following properties?
A.They must be able to form a barrier.
B.They must be able to resist large amounts of shearing forces.
C.They must be able to communicate with each other very rapidly.
D.They must be able to recycle chemicals that they have released.
2. What happens to the fluid as it moves through the capillaries?
A.The higher hydrostatic pressure at the arterial end of the capillary forces some fluid from the plasma out into the interstitial space.
B.The osmotic pressures in plasma and in the interstitial fluid are equivalent, so no fluid leaves the capillary.
C.The hydrostatic pressures inside the capillary and the interstitial fluid are equivalent, so no fluid leaves the capillary.
D.The hydrostatic pressure in the interstitial fluid is higher than in the plasma, so some interstitial fluid enters the capillary.
3. Many factors affect blood flow and delivery to the organs of the body. Which of the following factors causes the greatest increase in blood flow?
A.Decreasing vessel length
B.Vasodilation
C.Decreasing blood viscosity
D.Vasoconstriction
4. Pacemaker cells in the heart are very important. Which of the following are unique characteristics of these pacemaker cells in the heart? (more than one answer is correct)
A.The pacemaker cells come into direct physical contact with cardiac muscle cells and cause them to contract
B.The pacemaker cells spontaneously depolarize
C.The pacemaker cells require the nervous system to activate them
D.The pacemaker cells have an unsteady resting membrane potential
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