bio 250 cardio/heart
Cardiovascular System: The Heart
Laszlo Vass, Ed.D. Version 42-0006-05-01
Lab Report Assistant
This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor.
Purpose
Explain why you did this exercise. Where there any safety precautions you needed to follow? If so, what were they?
Exercise 1: Microscopic Anatomy of Cardiac Muscle
Observations
Sketch and label your slide in the space provided. Include a description of the structures you observed on the slide.
See attached photo.
Questions
A. What are some unique structural features of cardiac muscle?
The cardiac cells are arranged in spirals 8 bundles. Presence of irregularly spaced dark bands between the myocytes.
B. What are intercalated discs and what do they do?
Intercalated discs are cross-bands that separate the opposing ends of cardiac muscle cells. They help hold adjacent cells together and transmit the force of contraction from cell to cell.
C. Why does cardiac muscle have to be both elastic and strong?
The heart to be both elastic and strong to meet the needs of human body. The elasticity of the atria and ventricles I s import to accommodate the preload that stretch of the myofibrils that is vital for cardiac output.
D. Which of the three layers of the heart did the tissue used to make your slide originate from?
Myocardium/muscle tissue
Exercise 2: The
Laszlo Vass, Ed.D. Version 42-0006-05-01
Lab Report Assistant
This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor.
Purpose
Explain why you did this exercise. Where there any safety precautions you needed to follow? If so, what were they?
Exercise 1: Microscopic Anatomy of Cardiac Muscle
Observations
Sketch and label your slide in the space provided. Include a description of the structures you observed on the slide.
See attached photo.
Questions
A. What are some unique structural features of cardiac muscle?
The cardiac cells are arranged in spirals 8 bundles. Presence of irregularly spaced dark bands between the myocytes.
B. What are intercalated discs and what do they do?
Intercalated discs are cross-bands that separate the opposing ends of cardiac muscle cells. They help hold adjacent cells together and transmit the force of contraction from cell to cell.
C. Why does cardiac muscle have to be both elastic and strong?
The heart to be both elastic and strong to meet the needs of human body. The elasticity of the atria and ventricles I s import to accommodate the preload that stretch of the myofibrils that is vital for cardiac output.
D. Which of the three layers of the heart did the tissue used to make your slide originate from?
Myocardium/muscle tissue
Exercise 2: The