After traveling through the AV node, an electrical impulse travel to which of the following components of an effective cardiac conduction system?
Purkinje fibers
Bundle of His
Bundle branches
SA node
The Correct Answer is B
a. Purkinje fibers: Purkinje fibers are the last structures to receive the signal within the ventricles, causing them to contract.
b. Bundle of His: The correct sequence of the cardiac conduction system is as follows: The electrical impulse originates in the sinoatrial (SA) node, then travels to the atrioventricular (AV) node. From the AV node, the impulse travels to the Bundle of His. After the Bundle of His, the impulse travels through the bundle branches and finally reaches the Purkinje fibers, which facilitate the contraction of the ventricles.
c. Bundle branches: The electrical impulse for heartbeat originates in the SA node (sinoatrial node). It then travels to the AV node (atrioventricular node), which delays the signal before sending it to the Bundle of His. The Bundle of His splits into right and left bundle branches, which distribute the electrical signal to the Purkinje fibers in the ventricles, causing them to contract in a coordinated fashion.
d. SA node: The SA node initiates the electrical impulse, not receive it after the AV node.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
a. Subclavian vein: The lymphatic system drains lymph into the cardiovascular system at the subclavian veins, specifically where the lymphatic ducts (thoracic duct and right lymphatic duct) empty.
b. Carotid artery: This is an artery supplying blood to the brain, not involved in returning lymph.
c. Ascending aorta: This is the part of the aorta that rises from the heart and distributes oxygenated blood, not involved in lymph return.
d. Jugular vein: While close to the lymphatic ducts, lymph specifically drains into the subclavian veins.
Correct Answer is C
Explanation
a. Spermatozoa: These are the mature male gametes (sperm cells) that result from spermatogenesis but do not describe the process of meiosis itself.
b. Spermiogenesis: This is the final stage of spermatogenesis, where spermatids undergo morphological changes to become mature spermatozoa.
c. Spermatogenesis: This is the process that includes both meiosis and subsequent maturation steps, resulting in the formation of spermatozoa. It involves the production of haploid sperm cells from diploid germ cells.
d. Spermatocytes: These are the cells that undergo meiosis during spermatogenesis. Primary spermatocytes undergo the first meiotic division to form secondary spermatocytes, which then undergo the second meiotic division to produce spermatids.
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