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After traveling through the AV node, an electrical impulse travels to which of the following components of an effective cardiac conduction system?

A.

Bundle branches

B.

Purkinje fibers

C.

SA node

D.

Bundle of His

Answer and Explanation

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.


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Correct Answer is A

Explanation

The function of connective tissue is best described as binding tissue together and supporting structures. Connective tissue plays a crucial role in connecting different tissues and organs, providing support and structure throughout the body.

Correct Answer is D

Explanation

A. Bowman's capsule:
Bowman's capsule is the initial part of the nephron where blood is filtered to form glomerular filtrate. The filtrate is collected here after being filtered through the glomerulus. However, after traveling through the proximal convoluted tubule, the filtrate does not return to Bowman's capsule.

B. Collecting duct:
The collecting duct is the final part of the nephron where urine is collected after it has passed through the nephron’s other components. The glomerular filtrate enters the collecting duct after passing through the Loop of Henle and the distal convoluted tubule, not directly from the proximal convoluted tubule.

C. Glomerulus:
The glomerulus is a network of capillaries located within Bowman's capsule where blood filtration begins. After filtration occurs, the filtrate moves into the proximal convoluted tubule. The filtrate does not return to the glomerulus after it has passed through the proximal convoluted tubule.

D. Loop of Henle:
After the glomerular filtrate passes through the proximal convoluted tubule, it enters the Loop of Henle. This segment of the nephron is crucial for concentrating urine by reabsorbing water and salts from the filtrate, thereby playing an essential role in the body's fluid and electrolyte balance.

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