Functionality of Cardiac and Skeletal Muscles

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Functionality of Cardiac and Skeletal Muscles

Sean Tavakoli

April 14, 2010

Section: A020

Abstract:

Lab exercises 8 and 9 were performed to learn about the physiological properties of skeletal and cardiac muscles. In lab exercise 8, the gastrocnemius muscle was isolated from a bullfrog and several experiments were performed with a kymograph to test the effect of stimulus intensity on a muscle, the timing of muscular contraction, and testing titanic contraction. In lab exercise 9, a bullfrog heart was used to understand the properties of cardiac muscle. Cardiac muscle is very unique, because it can only be found in the heart organ. Experiments in lab exercise 9 included controlling the heart rate with four different agents: adrenalin, cold ringer's solution, warm ringer's solution, and acetylcholine. Additionally, the initiation and transmission of cardiac contraction was tested by stopping the SA node and finally looking at the reaction properties of cardiac muscle with the assistance of a kymograph (Stefaniak pg 84).

Introduction:

Skeletal and Cardiac muscles can be very similar. They possess the ability to contract due to the actin and myosin sliding filaments, which is a trait in every type of muscle