The Cardiac Cycle in Frogs: What is the Longest Part?

This is the same in humans, as diastole is the longest phase of the cardiac cycle. However, in a frog heart without autonomic input, the relaxation of the ventricle is the longest part of the cycle.
  • #1
nokia8650
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I was struggling with the following question:

In a frog heart preparation that is beating spontaneously, the longest part of the cardiac cycle involves:

A. Contraction of the atria
B. Contraction of the ventricle
C. Relaxation of the ventricle
D. Electrical conduction through the atrioventricular node
E. Electrical conduction from the atrioventricular node to the ventricle

i know in humans that the longest phase of the cardiac cycle is diastole, but I am not sure what applies to a frog heart which is beating spontaneously (ie without autonomic input).

thanks alot!
 
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  • #2
The longest part of the cardiac cycle in a frog heart that is beating spontaneously is C. Relaxation of the ventricle. During diastole, blood fills the ventricle, allowing for the subsequent contraction.
 

Related to The Cardiac Cycle in Frogs: What is the Longest Part?

1. What is the cardiac cycle in frogs?

The cardiac cycle in frogs refers to the sequence of events that occur during one complete heartbeat. It includes both the contraction and relaxation of the heart chambers to pump blood throughout the body.

2. How long does the cardiac cycle in frogs last?

The duration of the cardiac cycle in frogs can vary depending on the species, but on average it lasts about 0.8 seconds. This is significantly longer than the cardiac cycle in humans, which typically lasts around 0.8 seconds.

3. What is the longest part of the cardiac cycle in frogs?

The longest part of the cardiac cycle in frogs is the diastolic phase, specifically the isovolumetric relaxation phase. This is when the heart muscles relax and the ventricles fill with blood, preparing for the next contraction.

4. How does the cardiac cycle in frogs differ from other animals?

The cardiac cycle in frogs is different from other animals in several ways. For example, unlike mammals, frogs have a three-chambered heart instead of a four-chambered heart. They also have a lower heart rate and a longer diastolic phase.

5. What factors can affect the duration of the cardiac cycle in frogs?

The duration of the cardiac cycle in frogs can be influenced by several factors, including body temperature, activity level, and hydration status. Additionally, certain diseases or conditions can also affect the cardiac cycle in frogs, such as heart defects or infections.

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