Question

During exercise, which factor plays a greater role in fluctuating the pulse pressure (systolic / diastolic / both / neither)?

Why could a large blood loss potentially cause iron-deficiency anemia?

1. What is pH?

2. A blood sample with a pH of 7.4 would be considered acidic / neutral / basic?

3. Why must blood pH be regulated?

Answer 1

A.during exercise the pulse pressure is influenced by both the systolic pressure and thediastolic bp. The pulse pressure increases with exercise due to increased stroke volume.The increased heart rate leads to an increase in the systolic pressure and a decrease in the diastolic pressure, which results in an increase in pulse pressure.

B.

During bleeding a considerable amount of iron and red blood cells are lost through the blood.The bonemarrow is then put under load to compensate the amount of RBC lost fom the body.This increased demand combined with the amount of iron lost causes anaemia in the body.

1.pH is the negative logarithm of the of hydrogen ion concentration in moles per litre.It is a value used to express the amount of acidity or alkalinity.

2.The normal pH is 7.All the values above 7 are considered to be basic.So 7.4 is basic.

3.Maintanance of the pH is an important factor of homoeostasis.This is because the various biochemical reactions that are important for the body are catalysed by enzymes.These enzymes are highly sensitive to the pH levels and hence pH must be maintained for the proper functioning of the body.