Human Physiology Test I, Human Physiology Quiz |questions with correct answers

What are the vessels that bring blood back to the heart? - ANSWERS: Superior and inferior vena cava what chamber of the vena cava go into? - ANSWERS: right atrium what determines heart rate? - ANSWERS: SA Node where is the SA node located? top of right atrium below where the superior vena cava comes in - ANSWERS: what structures are the end of cardiac cells joined at? - ANSWERS: Intercalated disks what is a desmosome? - ANSWERS: contained in intercalated disks - collagen fibers that connects the cells together and to which the myofibrils are attached what all is found along an intercalated disk? - ANSWERS: desmosomes and gap junctions what are jap junctions - ANSWERS: allows K+ to travel through them and spread action potential what happens when the size of the heart increases? - ANSWERS: bigger volume -> sucking force -> sucks blood in at what length do the sarcomeres of cardiac muscle generally rest? - ANSWERS: 18 micrometers why are the sarcomeres of cardiac muscle smaller than in other muscle cells? - ANSWERS: This allows it to be stretched to generate a