Why does decreased BPG levels in stored blood require the blood be discarded after about 6 weeks quizlet?

Why is transfused blood discarded after about 6 weeks of storage? The BPG levels are too low for adequate release of oxygen to tissues.

Why is fetal hemoglobin very efficient at picking up oxygen?

Why is fetal hemoglobin very efficient at picking up oxygen? The BPG levels are much higher than in maternal hemoglobin.

What is the volume of air that can be forcibly expired after expiration of the tidal volume quizlet?

tidal volume. What is the volume of air that can be forcibly expired after expiration of the tidal volume? inspiratory capacity. 152 mm Hg.

What factors are responsible for the decrease in alveolar volume during a normal expiration?

Expiration (exhalation) is the process of letting air out of the lungs during the breathing cycle. During expiration, the relaxation of the diaphragm and elastic recoil of tissue decreases the thoracic volume and increases the intraalveolar pressure. Expiration pushes air out of the lungs.

What happens to hemoglobin as blood pH decreases?

As blood plasma pH decreases (= becomes more acidic), H+ ions increasingly bind to hemoglobin amino acids, which lessens hemoglobin’s affinity for O2. This is referred to as the Bohr effect.

When carbon dioxide levels in the blood decreases the?

As the partial pressure of carbon dioxide in the blood decreases, respiratory alkalosis, characterized by decreased acidity or increased alkalinity of the blood, ensues. In turn, alkalosis causes constriction of the small blood vessels that supply the brain.

What is formed when Oxyhaemoglobin splits?

Here the oxygen and haemoglobin combine forming oxyhaemoglobin. The process in which haemoglobin unloads oxygen is called disassociating, and occurs in regions of low oxygen concentrations – in tissues. Here oxyhaemoglobin splits back into oxygen and haemoglobin.

Why is fetal haemoglobin replaced?

Blood transfusion with adult haemoglobin (HbA) replaces foetal haemoglobin (HbF). HbA has a lower affinity for oxygen than HbF and therefore leads to increased oxygen availability to the tissues including the retina.

What is the volume of the air that can be forcibly expired after expiration of the tidal volume?

about 1,200 mL
The expiratory reserve volume (ERV), about 1,200 mL, is the additional air that can be forcibly exhaled after the expiration of a normal tidal volume.

What creates the movement that helps inspiration and expiration of air during pulmonary ventilation?

Contraction and relaxation of the diaphragm and intercostals muscles (found between the ribs) cause most of the pressure changes that result in inspiration and expiration. These muscle movements and subsequent pressure changes cause air to either rush in or be forced out of the lungs.

Why is expiration longer than inspiration?

Expiration time is measured by listening with stethoscope over Trachea. Expiration even though is physiologically longer than inspiration, on auscultation over lung fields it will be shorter. The air moves away from alveoli towards central airway during expiration, hence you can hear only early third of expiration.

How does inspiration and expiration work?

The processes of inspiration (breathing in) and expiration (breathing out) are vital for providing oxygen to tissues and removing carbon dioxide from the body. Inspiration occurs via active contraction of muscles – such as the diaphragm – whereas expiration tends to be passive, unless it is forced.