After traveling through the AV node, an electrical impulse travels to which of the following components of an effective cardiac conduction system?
Bundle branches
Purkinje fibers
SA node
Bundle of His
The Correct Answer is D
A. Bundle branches:
The bundle branches are components of the cardiac conduction system that the electrical impulse reaches after it passes through the Bundle of His. These branches carry the impulse down the interventricular septum towards the Purkinje fibers. The bundle branches do not directly follow the AV node in the sequence of conduction.
B. Purkinje fibers:
Purkinje fibers are the final part of the cardiac conduction system that receives the electrical impulse. These fibers distribute the impulse throughout the ventricles, causing them to contract. However, the impulse must first pass through the Bundle of His and bundle branches before reaching the Purkinje fibers.
C. SA node:
The SA node (sinoatrial node. is the heart's natural pacemaker, where the electrical impulse originates. The impulse travels from the SA node to the AV node before it proceeds to the Bundle of His. Therefore, the SA node is involved earlier in the conduction pathway, not after the AV node.
D. Bundle of His:
After the electrical impulse passes through the AV node, it travels to the Bundle of His. The Bundle of His serves as the pathway for the impulse to move from the atria to the ventricles, making it the correct answer. This structure is critical for ensuring that the impulse is properly conducted to the ventricles to facilitate coordinated contraction.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Eccrine:
Eccrine glands are sweat glands that are responsible for producing a watery sweat that helps regulate body temperature. They do not produce oil and are not involved in lubricating hair follicles.
B. Ceruminous:
Ceruminous glands are specialized sweat glands located in the ear canal. They produce cerumen (earwax. , which helps protect the ear from debris and microorganisms, but they do not produce oil for hair follicles.
C. Sebaceous:
Sebaceous glands are responsible for producing sebum, an oily substance that lubricates and protects hair follicles and the skin. This oil helps keep hair and skin moisturized and is the correct answer for the gland that lubricates hair follicles.
D. Apocrine:
Apocrine glands are a type of sweat gland found in specific areas such as the armpits and genital regions. They produce a thicker sweat that can contribute to body odor but do not produce oil to lubricate hair follicles.
Correct Answer is A
Explanation
A. Micturition:
Micturition is the process of voluntary urination. It involves the controlled release of urine from the bladder through the urethra. This process is regulated by both voluntary and involuntary mechanisms, including the relaxation of the external urethral sphincter to allow urine to exit the body.
B. Incontinence:
Incontinence refers to the inability to control urination, leading to involuntary leakage of urine. It is not a process of voluntary urination but rather a condition where voluntary control is impaired.
C. Reabsorption:
Reabsorption is the process by which the kidneys reclaim water and solutes from the filtrate and return them to the bloodstream. It is part of urine formation but not directly related to the act of voluntary urination.
D. Filtration:
Filtration is the process by which the kidneys filter blood to create urine. It occurs in the renal glomeruli and is an initial step in urine formation, but it does not pertain to the voluntary act of urination.
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