Question

What is tallquist paper used to determine in blood?

Answer 1

The tallquist method utilizes the tallquist paper which is used to measure the concentration of oxygen in the blood. The tallquist paper is saturated with blood and is then compared to a tallquist chart.

Complete answer:
The tallquist paper is used to measure the concentration of haemoglobin in the blood.
Haemoglobin is an iron-containing protein present in erythrocytes. The primary function of haemoglobin is the transport of oxygen. They are present in almost all vertebrates and in some invertebrates. Haemoglobin transports oxygen from the lungs to all parts of the body. Haemoglobin has a concentration of 10-20 grams per 100ml of blood.
Haemoglobin also transports other gases like carbon dioxide. It carries almost $25\%$ of the carbon of the body in the form of a compound called carbaminohemoglobin. The carbon dioxide binds to the heme protein of the haemoglobin. Haemoglobin also carries nitric oxide through the blood which is released along with oxygen.
Haemoglobin may carry oxygen or small ions in some invertebrates. Leghaemoglobin is an oxygen scavenging system in leguminous plants which takes away oxygen from anaerobic systems.
Haemoglobin is a quaternary structure protein. The alpha helices in haemoglobin are connected through non-helical structures. A haemoglobin molecule consists of four globular proteinaceous subunits in vertebrates.

Note:
Oxyhaemoglobin is formed during respiration. The compound is formed when oxygen binds to the heme protein of haemoglobin in red blood cells. The binding of oxygen to heme protein occurs in the pulmonary capillaries. These pulmonary capillaries are located adjacent to the alveoli of the lungs.