What is the role of Connective tissue within the Heart? Select ALL that apply ? It helps cardial contraction by adding to the contractile strength ? It inhibits chaotic Sinus rhythm by inhibiting random impulse transfer fro atria to ventricles ? It helps sybchronize impulse generated by conduction system ? It provides structural support to the heart valves ? It helps direct electrical impulses to a single route from Atrial and Ventricles
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Step 1: Connective tissue in the heart provides structural support to the heart valves. Show moreā¦
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1) The sulcus that separates the atria from the ventricles is the atrioventricular sulcus. 2) Neighboring cardiac muscle cells in the walls of heart chambers have specialized cell-cell contacts that electrically and mechanically link the cells together, permitting the immediate passage of muscle impulses. These cell contacts are called intercalated discs. 3) Unidirectional flow in the heart is ensured because the heart contains valves that prevent backflow. 4) Check all that are a function of the pericardium. Check All That Apply: Prevent the heart from bouncing in the thoracic cavity, Prevent the heart from overfilling with blood, Aid the heart in the strength of contractions, Create a frictionless environment through the production of serous fluid. 5) The fibers that extend through the walls of the ventricles and allow the rapid, immediate spread of the impulse throughout the ventricular myocardium are called Purkinje fibers. 6) The fibers that extend through the walls of the ventricles and allow the rapid, immediate spread of the impulse throughout the ventricular myocardium are called Purkinje fibers. 7) The valve that prevents backflow of blood into the right ventricle is the tricuspid valve. 8) True or False. The less extensive distribution of T-tubules contributes to the more delayed onset and prolonged contraction of cardiac muscle tissue compared to skeletal muscle tissue.
Adi S.
Hubert A.
When a sudden decrease in blood pressure is detected by the body, which of the following occur in an attempt to correct the decrease (that is, to maintain homeostasis)? Choose ALL that apply. - There is a decrease in parasympathetic signaling to the heart. - There is a decrease in action potentials traveling through the accelerator nerve. - There is a decrease in sympathetic signaling to the heart and blood vessels. - There is an increase in sympathetic signaling to the heart but not the blood vessels. - There is an increase in sympathetic signaling to the heart and blood vessels. Which of the following characteristics of cardiac muscle are TRUE? Choose ALL that apply. - They rely on the autonomic nervous system to initiate contraction/depolarization. - They do not have transverse tubules. - The cardiomyocytes are capable of graded contractions/tension development. - They have smaller sarcoplasmic reticuli compared with skeletal muscle cells. - Their mitochondrial volume is large because they are highly aerobic. - They rely entirely on extracellular calcium for force development. Describe and explain what would happen to the pacemaker current and heart rate of this cell if extracellular Na+ concentration was increased (this is called hypernatremia). You must explain your reasoning mechanistically. Which of the following will result from increased sympathetic signaling on contractile cardiomyocytes? Choose ALL that apply. - Slower but stronger contractions of cardiomyocytes. - Increase in Ca2+ entry from the ECF but decreased Ca2+ release by the sarcoplasmic reticulum. - Release of activated phospholamban to inhibit SERCA. - Faster relaxation of the cardiomyocyte. - Phosphorylation of phospholamban resulting in faster activity of SERCA. Intercalated disks are ___________________________. Choose ALL that apply. - The only areas of the myocardial cell membrane where calcium enters the cell. - Found in all striated muscle tissue. - The location of anchoring junctions between adjacent myocardial cells. - Areas of myocardial cell membrane where tight junctions connect adjacent cells. - Areas of myocardial cell membrane where gap junctions connect adjacent cells.
Madhur L.
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