AP Biology : Circulatory System
Study concepts, example questions & explanations for AP Biology
All AP Biology Resources
Example Questions
Example Question #21 : Circulatory System
After passing through the bicuspid valve, blood enters which structure?
Aorta
Right ventricle
Left ventricle
Pulmonary artery
Left atrium
Left ventricle
Blood flows from the vena cavae into the right atrium, then into the right ventricle through the tricuspid valve. From here, blood is pumped into the pulmonary artery through the pulmonary semilunar valve. Oxygen-rich blood returns to the left atrium via the pulmonary veins. Blood flows from the right atrium into the right ventricle through the bicuspid valve. From the left ventricle, blood is pumped into the aorta, through the aortic semilunar valve.
Example Question #22 : Circulatory System
What type of muscle makes up the human heart?
Endocrine muscle
Skeletal muscle
Smooth muscle only
Smooth and cardiac muscle
Cardiac muscle only
Cardiac muscle only
The heart is composed of cardiac muscle. This is the only location in the entire body that contains this type of muscle. Skeletal muscles are those attached to bones, and are under voluntary control. While contraction and relaxation of smooth muscle is involuntary, it is not found in the heart. Cardiac muscle is unique in that the cells are connected via gap junctions, which allows rapid electrical conduction between them, producing wavelike contractions of the heart, essential to its function.
Example Question #23 : Circulatory System
Which chambers of the heart contain oxygen-poor blood?
Left atrium and right ventricle
Right ventricle and left ventricle
Right atrium and left atrium
Right atrium and right ventricle
Left atrium and left ventricle
Right atrium and right ventricle
The right side of the heart contains oxygen-poor blood. The right atrium receives oxygen-poor blood from the body through the superior and inferior vena cavae. This blood then flows into the right ventricle and then out the pulmonary valve into the lungs where the blood becomes oxygen-rich. The oxygen-rich blood goes to the right atrium then to the right ventricle where it is pumped to the system to provide oxygen to the cells of the body.
Example Question #24 : Circulatory System
Which correctly lists all the valves of the heart?
Tricuspid valve, pulmonary valve, and aortic valve
Tricuspid valve, pulmonary valve, bicuspid valve, and aortic valve
Tricuspid valve and aortic valve
Tricuspid valve, bicuspid valve, and aortic valve
Tricuspid valve, bicuspid valve, aortic valve, and brachial valve
Tricuspid valve, pulmonary valve, bicuspid valve, and aortic valve
There are four valves in the heart. The tricuspid valve separates the right atrium from the right ventricle. The pulmonary valve separates the right ventricle from the pulmonary arteries. The bicuspid valve separates the left atrium from the left ventricle. The aortic valve separates the left ventricle from the aorta. These valves separate the chambers of the heart, and prevent back flow from one chamber to the other. The tricuspid valve is also known as the right atrioventricular valve, and the bicuspid valve is also known as the left atrioventricular valve, and the mitral valve.
Example Question #25 : Circulatory System
Which structure of the adult human heart receives blood directly from the pulmonary circulation?
Right ventricle
Left atrium
Pulmonary artery
Right atrium
Left ventricle
Left atrium
The pulmonary circulation carries oxygenated blood from the lungs to the left atrium via the pulmonary veins. From there it enters the left ventricle, then it is pumped out through the aorta to serve organs of the body.
Example Question #26 : Circulatory System
Which of the following statements about adult human heart anatomy are false?
The right ventricle pumps oxygen-rich blood into the pulmonary circulation
The left atrium receives oxygen-rich blood from the pulmonary circulation
The right atrium receives oxygen-poor blood from the systemic circulation
The left ventricle pumps oxygen-rich blood into the systemic circulation
The left atrium sends oxygen-rich blood to the left ventricle
The right ventricle pumps oxygen-rich blood into the pulmonary circulation
The right ventricle pumps oxygen-poor blood into the pulmonary circulation, not oxygen-rich blood. This blood leaves the right ventricle through the pulmonary artery and reaches the lungs. All other answer choices are true statements.
Example Question #24 : Circulatory System
When you listen to a beating heart, you will notice two sounds (“lub” and “dub”). The first sound (“lub”) is when the mitral and the tricuspid valves close at the same time. The second sound (“dub”) is due to the closing of the pulmonary and the aortic valves at the same time.
In some heart conditions, one might hear an extra sound between the “lub” and the “dub” sounds. Which of the following choices is the most plausible explanation for the extra sound?
The mitral valve closed, opened, and then closed again
The pulmonary valve did not close completely
The tricuspid valve opened too late
The aortic valve did not close completely
The mitral valve did not close completely
The mitral valve did not close completely
The first sound (“lub”) occurs when the mitral and the tricuspid valves close. The second sound (“dub”) occurs when the pulmonary and the aortic valves close. The mitral and tricuspid valves close after both the left and the right atrias have contracted and have released blood into the ventricles. Transitioning towards the second heart sound, the ventricles contract and release blood into the systemic and pulmonary circulatory systems. If an extra noise is heard between the “lub” and the “dub” sounds, then it meant that while the ventricle is contracting, some blood is being pushed back into the atria(s) because the tricuspid valve and/or the mitral valve(s) did not completely close, resulting in regurgitation.
Example Question #27 : Circulatory System
When you listen to a beating heart, you will notice two sounds (“lub” and “dub”). The first sound (“lub”) is when the mitral and the tricuspid valves close at the same time. The second sound (“dub”) is due to the closing of the pulmonary and the aortic valves at the same time. In some heart conditions, one might hear an extra sound between the “lub” and the “dub” sounds.
In some heart conditions, one might hear a splitting sound during the “dub” sound. Which of the following choices is the most plausible explanation for the extra sound?
The mitral the pulmonary valves did not close at the same time
The aortic and the pulmonary valves closed at the same time
The tricuspid and the pulmonary valves closed at the same time
The mitral valve and the tricuspid valve did not close at the same time
The aortic and the pulmonary valves did not close at the same time
The aortic and the pulmonary valves did not close at the same time
The “dub” sound occurs when both the aortic and the pulmonary valves close at the same time. When one closes later than the other, then the valve that closed late will create a splitting sound; therefore, creating an extra sound close to the first sound.
Example Question #28 : Circulatory System
When you listen to a beating heart, you will notice two sounds (“lub” and “dub”). The first sound (“lub”) is when the mitral and the tricuspid valves close at the same time. The second sound (“dub”) is due to the closing of the pulmonary and the aortic valves at the same time. In some heart conditions, one might hear an extra sound between the “lub” and the “dub” sounds.
In some heart conditions, one might hear a split sound during the “lub.” Which of the following choices is the most plausible explanation for the extra sound?
The mitral and the tricuspid valves did not close at the same time
The mitral and the tricuspid valves closed at the same time
The pulmonary and the mitral valves closed at the same time
The pulmonary and the tricuspid valves did not close at the same time
The aortic and the pulmonary valves did not close at the same time
The mitral and the tricuspid valves did not close at the same time
The "lub" heart sound occurs when both the mitral and the tricuspid valves close at the same time. If one hears a split sound, then it indicates that one of the two valves closed late.
Example Question #118 : Systems Physiology
The migration of cells is necessary for proper development during fetal life. At around the third week of fetal development, hematopoietic stem cells can be found in the yolk sac as well as in the mesoderm of the aorta, the gonads and in the mesonephros. At around the 3rd month, these stem cells migrate to the liver with some to the spleen and the lymph node. At around the 4thmonth, these cells then migrate to the bone marrow.
When taking a cross section of a bone, one will notice that some bone marrows are red while others are fat. Yellow bone marrows are inactive stem cells with the majority being fat cells. Active bone marrows are red. At birth, all of the bone marrows are red. At around the time of puberty, most are red but the amount decreases to 50% at around 18-25 years of age. Despite the change in bone marrow activity, membranous bones and of the arms of and legs remain active throughout life. However, the activity can be changed during pathological conditions.
Which scenario(s) will result in the activation of inactive bone marrows?
I. An injury resulting in minor bleeding of the pinky
II. An injury resulting in a rupture of the abdominal aorta
III. A paper cut of the 4th phalange
III only
I and II
II and III
II only
I only
I only
The activation of inactive bone marrows occur when the increase production of red blood cells is required. An major injury that result massive bleeding will reactive inactive bone marrows. Of the answer choices, a rupture of the abdominal aorta will result in massive internal bleeding.
All AP Biology Resources
