Question 1 (1 point) Imagine a red blood cell leaving the right ventricle of you
ID: 172723 • Letter: Q
Question
Question 1 (1 point)
Imagine a red blood cell leaving the right ventricle of your heart. To which chamber of the heart will that cell return first?
Question 1 options:
A
Right atrium.
B
Right ventricle.
C
Left atrium.
D
Left ventricle.
E
It is impossible to determine from the given information.
Question 2 (1 point)
What is considered the most critical function of erythrocytes?
Question 2 options:
A
The transport of oxygen.
B
Buffering against changes in blood pH.
C
Assisting in clot formation.
D
Protection against infection.
E
All of the above are correct.
Question 3 (1 point)
The electrical stimulus for each human heartbeat begins in the
Question 3 options:
A
left atrium at the sinoatrial node.
B
left ventricle at the sinoatrial node.
C
right atrium at the sinoatrial node.
D
right atrium at the atrioventricular node.
E
left atrium at the atrioventricular node.
Question 4 (1 point)
Essentially all exchange of gases and other materials between the circulatory system and tissues of the body or the outside world (e.g., in the lungs) occurs in the
Question 4 options:
A
lymphatic system.
B
arteries.
C
veins.
D
capillaries.
E
All of the above are correct.
Question 5 (1 point)
If a human red blood cell takes the shortest possible route from the right ventricle to the right atrium, then it must travel through this number of capillary beds.
Question 5 options:
A
One.
B
Two.
C
Three.
D
Four.
E
This question can't be answered with the information provided.
A
Right atrium.
B
Right ventricle.
C
Left atrium.
D
Left ventricle.
E
It is impossible to determine from the given information.
Explanation / Answer
Q.1.Answer C.Left atrium
In simple words, blood leaving the right ventricle is deoxygenated blood which is pumped out from heart to lungs.This bllood then carries oxygen from the lungs and return to the heart through left atrium.
Q.2.Answer D.All of the above are correct.
Erythrocytes are red blood cells which are in the shape of biconcave disks.These cells are red in color because of the presence of hemoglobin.The biconcave shape of these cells helps in the rise in surface area for the diffusion and transport of oxygen and carbon dioxide.
Erythrocytes help in the buffering of the pH in blood by altering the rate of Co2 in the lungs through carbaminohemoglobin.Erythrocytes act as an acid-base buffer in the blood maintaining pH.
In hemostasis/clotting RBCs are involved in the contaction process wherein the size of the clot is reduced to 1/3rdof the clot's initial size.This is an important step in the healing of wound and hence, erythrocytes assist in clot formation.
Though the options A,B,C are more related to erythrocyte functions,few recent studies have revealed that erythrocytes have direct role in some immune responses and hence also play a role in protection against infections.Most of these responses are associated with erythrocytes-pathogen interaction.
Q.3.Answer C:Right Atrium at the sinoatrial node
There is a poper electrical system in our heart to control and regulate the heart rate (heart beat/minute) and heart rhythm (regulated pumping of the 4 heart chambers).There are two types of cells in the electrical system of the heart:
a. Cells in the heart muscles which enables contraction of the heart chambers which in turn tiggers the electrical signal in the heart.
b.The other group are the cells that act as conductors of the triggered elctrical signals, which in turn travels through a complex pathways allowing a chain reaction of cell activation of the heart, thereby resulting in a heartbeat.
The electrical signal is triggered in a group of cells called the sinus node or the sinoatrial node found in the walls of the heart's right atrium.The signal is then carried through heart initially triggering both atria and then the two two ventricles.
Q.4. Answer D:Capillaries
In the human body , pumping of blood from the heart is via arteries which in turn circulates the blood through capillaries in between cells of the tissues in the oragnas.The blood is pumped back to the heart from the capillaries in the cells via venules and in turn the veins.Hence, capillaries act as a junction of exchange of gases and other materials between the circulatory system and tissues of the body.
Q.5.Answer: B:Two
RBCs have to travel hrough two capillary beds if they are takig the shortest possible route from the right ventricle to the right atrium.