Q: Which of the following is unique to cardiac musclecells?a. Only cardiac muscle contains a…
A: The cardiac muscles show the characteristics of both smooth and striated muscles. The cells of…
Q: Fill in the blank: Endings of parasympathetic nerve fibers secrete _______________________, which…
A: The cardiovascular system is responsible for circulating the blood throughout the body so that…
Q: If a baroreceptor detects low blood pressure, which of the following will result? Group of answer…
A: Monitoring of blood pressure and it's adjustment is done by baroreceptors. Baroreceptors are special…
Q: you move from a sitting position to a standing position. after 2 minutes of resting in the standing…
A:
Q: Which side(s) of the heart would affected by high pressure in the pulmonary circuit? Which side(s)…
A: BASIC INFORMATION PULMONARY CIRCUIT the blood pumped by right ventricles enters into the pulmonary…
Q: What is the difference between an endocrine and exocrine gland? Differences between cartilage and…
A: Introduction : Muscular tissue is a type of tissue that aids in muscle contraction. By exerting…
Q: Unlike skeletal and smooth muscle tissue, cardiac muscle is “self-excitable”. Explain how this…
A: There are three major types of muscles. They are skeletal muscles, smooth muscles, and cardiac…
Q: Explain the structure of cardiac muscle and how it helps produce coordinated contraction in each…
A: Cardiomyocytes or cardiac muscle cells form a highly branched cellular network in the heart. They…
Q: Ventricular Contractility increases in response to circulating Epinephrine. What factor is…
A: The heart is one of the vital organs of a human body. It is responsible for pumping blood through…
Q: What initiates action potentials in cardiac muscle?
A: Generation of action potential activates the neuron during the generation of stimuli. It is studied…
Q: Categorize the feedback mechanisms components below during BP regulation. stretch pressure receptor…
A: 1. Sensor 2 effector
Q: What would be the drawback of cardiac contractions being the same duration as skeletal muscle…
A: Cardiac muscles are specialized in the way that long action potentials are generated in the cardiac…
Q: what is contraction in cardiac muscle cells in response to
A: Muscle cells are the cells also known as myocytes that help in the formation of muscle tissues. The…
Q: Complete the sentence: ions initiate depolarization of cardiac muscle cells and ions are responsible…
A: Excitability is defined as the ability of the living tissue to give response to a stimulus. In all…
Q: What is a neuro-muscular junction? Please explain its function.2.- What is a chief muscle? Please…
A: Step 1 Hello. Since you have posted a question with multiple sub-parts, we will solve the first…
Q: Action potentials are spread rapidly between cardiac muscle cells by a. sarcomeres. b. intercalated…
A: An action potential is a way by which a neuron transports electrical signals.
Q: The pacemaker cardiac muscle cells rely on for their action potentials.
A: Cardiac muscles are found in the heart. They are auto excitable. Cardiac muscles are striated,…
Q: The muscle cells of a heart chamber work as a functional syncytium. In terms of heart function…
A: The heart is a meso-dermally derived organs. The walls of heart are made up of cardiac muscles.…
Q: How does excitation–contraction coupling in cardiac muscle resemble that of skeletal muscle? How is…
A: The calcium ions channels present in the plasma film are momentarily opened because of the…
Q: Muscle is striated and not under voluntary control Cardiac Smooth Skeletal
A: Just like skeletal muscle, Cardiac muscle is also striated or striped. They are located in the…
Q: What does the circled structure do?
A: Heart Mesodermally derived organ, is situated in the thoracic cavity between the lungs, slightly…
Q: Which ONE of the following statements is TRUE? OA Cardiac myocyte contraction results primarily from…
A: Given here are some statements . Following I will be discussing which among them is correct and…
Q: Is it necessary to monitor our heart rate? Why or why not?
A: Vital signs Vital signs are the basic components of physiological assessment and are the important…
Q: Why is your heart rate high after running a short distance, but not as elevated after running a much…
A: Introduction: To maintain blood circulation throughout the body, the heart beats nonstop. Its rate…
Q: A drug is found to partially inactivate fast sodium channels. Mow would this drug change the action…
A: Given: To find a drug that partially inactivate fast sodium channels. How it change the action…
Q: Why would your heart rate increase or decrease to help maintain homeostasis when you exercise
A: There are various variables or factors that work inside the body to maintain its normal state.…
Q: Describe why your heart rate increases with exercise. What would happen if your heart did not beat…
A: The heart is a muscular organ that pumps blood throughout the body. It is located in the middle…
Q: When you are cold, your blood vessels contract. However, your heart rate and blood pressure…
A: When the temperature increases or decreases beyond the set point of the body there is a…
Q: Explain the concept of tetany in skeletal muscle. Can cardiac muscle be tetanized? Explain the…
A: Tetanus is a condition of involuntary contraction of skeletal muscles with increased frequency of…
Q: The cardiac output of each ventricle is the same. Why is this? What would happen if the right…
A: The Cardiac Output is defined as the amount of blood that is pumped out by the two ventricles of the…
Q: The movement of which two ions is responsible for maintaining the plateau phase of the action…
A:
Q: If an individual had a disease that reduced the strength of cardiac muscle contraction, what aspect…
A: In vertebrates, cardiac muscle, also known as myocardium, is one of three major muscle groups found…
Q: Where are cardiac muscle cells found in the heart? O myocardium O pericardium O endocardium O great…
A: The heart is the main organ of the circulatory system of the body. It is located behind the…
Q: During work, blood flow through a muscle can increase 20 times but the cardiac output does not…
A: Vasoconstriction of blood vessels reduces the volume of blood vessels. Hence blood flow is also…
Q: One of the common antihypertensive agents is a class of medicines called calcium- channel blockers.…
A: Answer :- Option (C) is correct. - They reduce heart rate. - They block entry of calcium into heart…
Q: During the refractory period a second action potential______. A cannot occur because…
A: An action potential is generated when the membrane depolarized from resting potential. Resting…
Q: What do you mean by cardiac muscles?
A: Muscles are the structures that attach to the bones and enable the movement of the body. There are…
Q: Lucy is resting before her workout. Her heart is beating times 70 times per minute, and with each…
A: The volume of blood pumped into the circulatory system by the heart in one minute is known as…
Q: Which of the following would increase blood pressure? Group of answer choices Increased…
A: The parasympathetic activity or baroreflex is a mechanism of homeostasis that maintains the blood…
Q: In conditioned athletes, the resting Heart Rate is generally much lower than in non-athletes. Why?…
A: Option - d is correct
Q: During exercise, activation of alpha-adrenergic receptors in skeletal muscle arterioles: A)is…
A: *There are three types of adrenergic receptors are present alpha beta-1 beta-2 *Alpha receptors…
Q: Which of the following characteristics is NOT a property of cardiac muscles? Group of answer choices…
A: Our body consists of three types of muscles Smooth muscles, skeletal muscles, and Cardiac muscles.…
Q: Role cardioregulatory centers play in regulating heart rate
A: Cardio regulatory center is a part of brain that found in the medulla oblongata. It is responsible…
Q: Coordinated contractions of cardiac muscle are controlled by pacemaker cells, allow for your heart…
A: The pacemaker cells or SA node generate slow positive increase in voltage across the cells membrane…
Q: In which direction does Ca2+ move in response to the opening of voltage-gated Ca2+ channels: into or…
A: Voltage-gated ion channels are a type of transmembrane protein that forms ion channels that are…
Q: Discuss the differences between myogenic and neurogenic hearts and explain what the role of…
A: The heart is the main organ for the circulation of blood and transportation of oxygen throughout the…
Q: What is the significance of the extended refractory period in cardiac muscle?
A: Cardiac muscle contraction is a type of electrical event that begins at the sinoatrial node. As a…
Step by step
Solved in 2 steps
- Epinephrine is the chief neurotransmitter of the sympathetic nervous system. What effect would you expect it to have on the contractions of cardiac muscle? Explain.what is contraction in cardiac muscle cells in response toIn humans, the pacemaker of the cardiac muscle cells is stimulated to increase contraction rate by__ ?__ nerves: a) somatic sensory b) cerebellum c) sympathetic d) parasympathetic
- Action potentials in heart muscle cells have a prolonged plateau phase caused by ______through voltage-gated channels. A potassium entering B sodium leaving C sodium entering D calcium entering E calcium leavingDuring the refractory period a second action potential______. A cannot occur because voltage-gated Na+ channels are inactivated B cannot occur because the heart muscle cell has already returned to resting potential C can be initiated more easily because the threshold potential is reduced D can be initiated more easily because the calcium level in the sarcoplasm is increasedAction potentials are spread rapidly between cardiac muscle cells by a. sarcomeres. b. intercalated discs. c. chemical neurotransmitters. d. the fibrous skeleton.
- Explain the concept of tetany in skeletal muscle. Can cardiac muscle be tetanized? Explain the physiological significance of your answer.Atropine works by blocking acetylcholine receptors. If you add acetylcholine to the heart, followed by atropine, what would you expect to happen? Explain.The rate of heartbeat is accelerated by the hormone : A) adrenaline B) acetylcholine C) thyroxine D) pituitrin
- In which direction does Ca2+ move in response to the opening of voltage-gated Ca2+ channels: into or out of the cardiac muscle cells?Only one is correct Contraction of cardiac muscle is initiated during which phase of the fast action potential? What ion mediates this effect? A. Phase 0 due to Ca++ entry B. Phase 1 due to Na+ entry and K+ exit C. Phase 2 due to Ca++ entry D. Phase 4 due to K+ exit Group of answer choices Phase 2 due to Ca++ entry Phase 1 due to Na+ entry and K+ exit Phase 0 due to Ca++ entry Phase 4 due to K+ exitDescribe the movement in ions in action potentials of these cells - pacemaker cell - cardiac contractile cell