5. W hich structure is present in the right ventricle of the sheep's heart, but not in the left ventricle? Make a labeled sketch of cardiac muscle as you observed it under the microscope. Label the nucleus, intercalated discs, sarcolemma, and striations. 6. Cardiac Muscle Magnification: 7. Identify two differences between the structure of cardiac muscle tissue and skeletal muscle tissue Cardiac muscle tissue Skeletal muscle tissue

6. Can the radii of arterioles be adjusted independently to variably distribute cardiac output (amount of blood pumped per minute) among organs? Explain your answer. If you answered NO, then why are they not adjusted, or if you answered YES, then how are arteriole radii adjusted?

Syllabus BigBlueButton Collaborations What are the characteristics of cardiac muscle? A. Cells are short and branching. B. Cells have multiple nuclei at the periphery of the cell. C. They are composed of thick and thin filaments. E. All of the above D. The functional contractile unit is the sarcoplasm Chat My Media Student Feedback on Instruction Zoom McGraw-Hill Connect MyLab and Mastering Honorlock Announcements Qwickly Tools Library Modules Quizzes ○ A & C ○ A,B &C O B,C &D ○ A & B ◄ Previous No new data to

Complete the following statements about the structure of the different muscle types. Not all choices will be used.

6. ventricles Contraction begins at the __of the heart and squeezes blood from there to the __ A. apex, base B. left, right C. right, left D. base, apex

2. How is an action potential in a contractile cardiac cell different from action potential in a pacemaker cell? (Write the phases and the channels involved for each phase).

18. Under the microscope, I can see a section through one of the chambers of the heart. The myocardium is thick and the endocardium is very thin. In addition, I can see a valve that connects this chamber to the next which has two cusps that prevent backflow from one chamber into another. Where in the heart am 1? What does the thickness of the myocardium tell you about this region of the heart? What is the valve called? What does it do? What other valve would you see in this area of the heart? Where is it situated?

Smooth muscle cells have features that can be like Skeletal muscle, Cardiac muscle, or that can be unique to smooth muscle cells themselves. Match the 3 options below to the description of smooth muscle cells on the left. do NOT possess sarcomeres do NOT possess troponin or tropomyosin neurotransmitters and hormones regulate contraction different cells of the same muscle type can contract or relax in response to the 1. similar to skeletal muscle same neurotransmitter 2. similar to cardiac muscle possess gap junctions for coordinating contraction of multiple cells 3. unique to smooth muscle can generate contraction through an influx of Ca2+ across the plasma membrane use calmodulin and myosin light-chain kinase to start the cross-bridge cycle make use of motor units to control contraction >

Please I need help understanding this

7)Which of the following is the sequence of vessels the blood follows as it circulates? Select one: a. Heart, veins, capillaries, arteries, heart b. Heart, capillaries, arteries, veins, heart c. Heart, veins, arteries, capillaries, heart       d.Heart, arteries, capillaries, veins, heart e. Heart, arteries, veins, capillaries, heart