Biology Questions and Answers
Systole is the stage of the cardiac cycle
on which the lumen of these chambventriclesers is reduced and contract. So the (^)
the pressure upon the blood within
them is heightened.
During diastole the opposite occurs. The
muscle fibers of the ventriclesthe lumen of these chambers enlarges relax and
helping the entrance of blood.
- What is the stage of the
cardiac cycle during which the
ventricles are filled?
The filling of the ventricles with blood
occurs during diastole.
- Of which type of tissue is
the heart made? How is this
tissue oxygenated and
nutrified?
The heart is made of striated cardiac
muscle tissue.called the myocardium The heart mand it isuscle is
oxygenated and nutrified by thecoronary arteries. The coronary arteri (^) es
come from the base of the aorta and
ramify myocararound the heart penetrating dium. the
Diseassevere conditions.es of the coronary arteries are
- Which are the two main
metabolic gases transported
by the blood?
The main metabolic gases transported
by the blood are molecular oxyand carbon dioxide (CO gen (O 2 )
2 ).- How do respiratory
pigments act?
Respiratory pcarrying molecules prigments are esent in the blood.oxygen-
When the oxygen concefor example, in the pulmonary alveoli,ntration is high,
the respiratory pigments bind to the
gas. In conditions of concentration, e.g., in tissues, thlow oxygen (^) e
respiratory pigments release the
molecule.
In the human blood the respiratory
pigment is hemoglobin, present withinthe red blood cells.
- How different are
oxyhemoglobin and
hemoglobin? Where is it
expected to find a higher
concentration of
oxyhemoglobin, in peripheral
tissues or in the lungs?
Oxygen-bound hemoglobin is called
oxyhemoglobin. In the lungs the oxygenconcentration is higher and so there is a (^)
higher oxyhemoglobin concentration. Ithe peripheral tissues the situation is n
the reverse, the concentration of
oxygen is lowehemoglobin. r and there is more free
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