Identify the structures denoted by the following letters:
| J | dropdown |
| G | dropdown |
| D | dropdown |
The Correct Answer is {"dropdown-group-1":"A","dropdown-group-2":"B","dropdown-group-3":"C"}
Correct answer:
- J: Pulmonary veins
- G: Right ventricle
- D: Pulmonary trunk
J: Pulmonary veins- Pulmonary veins are blood vessels that carry oxygenated blood from the lungs to the left atrium of the heart. Normally, there are four pulmonary veins—two from each lung. They enter the posterior aspect of the left atrium and play a vital role in systemic circulation by delivering oxygenated blood for distribution throughout the body.
G: Right ventricle- The right ventricle is the lower right chamber of the heart responsible for pumping deoxygenated blood to the lungs for oxygenation. It receives blood from the right atrium through the tricuspid valve and ejects it into the pulmonary artery via the pulmonary valve. It generates enough pressure to move blood through the pulmonary arteries to the lungs, where carbon dioxide is exchanged for oxygen.
D: Pulmonary trunk- The pulmonary trunk is a large artery that carries deoxygenated blood from the right ventricle to the lungs. It begins at the pulmonary valve and extends upward before dividing into the right and left pulmonary arteries. It is located anterior to the ascending aorta and it transports blood to the lungs for gas exchange.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is {"dropdown-group-1":"A"}
Explanation
Correct answer: Tricuspid
The tricuspid valve is located between the right atrium and the right ventricle of the heart. It consists of three cusps that open to allow blood to flow from the right atrium into the right ventricle during diastole. During ventricular contraction (systole), the tricuspid valve closes, preventing the backflow of blood into the right atrium and ensuring that blood is efficiently pumped into the pulmonary artery through the pulmonary valve. Its anatomical position and function are essential for maintaining unidirectional blood flow within the right side of the heart and supporting effective pulmonary circulation.
Correct Answer is D
Explanation
A. The sodium ion channels open, allowing Na+ to enter the cell: Opening of sodium channels occurs during the depolarization phase of cardiac action potentials, not repolarization. The influx of Na+ rapidly raises the membrane potential, initiating the action potential and triggering subsequent calcium influx for contraction.
B. The calcium ion channels open, allowing Ca2+ to enter the cell: Calcium channels open primarily during the plateau phase (phase 2) of the cardiac action potential, allowing Ca2+ entry to sustain contraction. This occurs before repolarization and contributes to excitation-contraction coupling rather than the return to resting membrane potential.
C. Sodium ion channels close, preventing Na+ from entering: Sodium channel closure occurs immediately after depolarization and contributes to the refractory period, but it does not itself drive repolarization. The cell requires potassium efflux to restore the resting membrane potential.
D. Potassium ion channels open, allowing K+ to leave the cell: During repolarization (phase 3) of cardiac conducting cells, voltage-gated potassium channels open, permitting K+ to exit the cytoplasm. The outward movement of positively charged K+ restores the negative resting membrane potential, terminating the action potential and preparing the cell for the next depolarization.
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