1. Whenever skeletal muscle blood flow increases, blood flow to other organs mus

Question

1. Whenever skeletal muscle blood flow increases, blood flow to other organs must decrease. True or false?

2. Suppose the diameters of the vessels within an organ increase by 10%. With all other factors remaining constant, how would this affect the:

a. resistance to blood flow through the organ?

b. blood flow through the organ?

3. The pressure in the aorta is normally about 100 mm Hg, whereas the pressure in the pulmonary artery is normally about 15 mm Hg. A few of your fellow students offer the following alterative hypotheses about why this might be so:

a. The right heart pumps less blood than the left heart.

b. The right heart rate is slower than the left heart rate.

c. The right ventricle is less muscular than the left ventricle.

d. The pulmonary vascular bed has less resistance than the systemic bed.

e. The stroke volume of the right heart is less than that of the left heart.

f. It must be genetics.
Which of their suggestions is (are) correct?

4. Usually, an individual who has lost a significant amount of blood is weak and is unable to reason well. Why would blood loss have these effects?

5. Determine the direction of transcapillary fluid movement () within a tissue, given the following data:

Capillary hydrostatic pressure, Pc = 28 mm Hg
Plasma oncotic pressure, c = 24 mm Hg
Tissue hydrostatic pressure, Pi = 4 mm Hg
Tissue oncotic pressure, i = 0 mm Hg

Explanation / Answer

1) TRUE

2) a Resistance decreases when diameter increases; resistance is inversely proportional to diameter.

    b the blood flow increases as diameter increases; the blood flow is directly proportional to the diameter of the blood vessel

3) the right heart pumps less blood than the right

4) Significant blood loss initiates a sequence of stress responses that are intended to preserve flow to vital organs and signals cells to expend internal energy stores; this results in weakness in the body. Adrenergic reflexes that have neural and circulating hormonal components are activated. Neural effects are immediate and also result in hormonal changes. The persons mental status is disturbed

5) the direction of the fluid is outwards from the capillary

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