Biology Questions and Answers
- What is the stage of
cellular respiration during
which carbon dioxide is
liberated?
In aerobic cellular rrelease of carbon dioxide happens in theespiration the (^)
transformation oacetyl-CoA (two f pyruvic acid intomolecules) and in the (^)
Krebs cycle (four molecules). For each
glucose mmolecules arolecule, e made.six carbon dioxide
- How is carbon dioxide
released by cellular
respiration transported from
the tissues to be eliminated
through the lungs?
In vertebrates almost 70% of the
carbon dioxide is transportblood in the form of bicarbonated by thee, 25% (^)
bound to hemoglobin and 5% dissolved
in the plasma.
- What is the difference
between double closed
circulation and simple closed
circulation?
Double closed circulation, or closed
circulation, is that in circulates through two associated anwhich the bloodd (^)
parallel vascular systems: one that
carries bthe peripheral tissueslood to and takes b (the systemiclood from
circulation) and the other that carries
blood to antissues that ped takes brform gas elood from thexchange with (^)
the environment, e.g, the lungs
(pulmonary circulation). Double
circulation occurs in reptiles, birds and mammals.amphibians,
Simple closed circulation, is thcirculation,e one in which or simplthee
tissues that perform gas exchange are
associated in circulation, as in series with fishes. the systemic
- How many chambers does
the fish heart have?
The fish heart is a tuconsecutive chambers: obe made of twone atrium an (^) d
one ventricle.
- Does the fish heart pump
venous or arterial blood?
The venous btissues enters thlood comine atrium ag from thend passes to (^)
the ventricle that then pumps the blood
towards the gills. After oxythe gills the arterial blood goes to thgenation ine
tissues. So thblood. e fish heart pumps venous
- Why is the fish circulation
classified as a simple and
complete circulation?
Completthere is no mixture oe circulation isf venous blood and that in which (^)
arterial blood. Simple circulation is that
in which tcircuit (as opposed to the doublehe blood circulates only in one
circulation that have two circuits, the
systemic circulation and the pulmonary
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