Doctor insights on:
Cardiac Muscles Examples
It is a body tissue that has the ability to contract. It shortens and generates force. It relaxes and returns to its original length. Muscles move joints, stabilize the body, move air and food through the organs, act as valves for bladder, bowel and other organs. They control movement of the eyes. They help us express ourselves by changing the shape of our ...Read more
Depends: It depends on which cardiac muscle tissue. In the SA node, its around -50 mv. In subsidiary pacemakers it can be as much as -90 mv. ...Read more
No: Intercalated discs allow cardiac cells to join together. They're not really within a cardiac cell. Good luck on your exam or whatever it is that prompted you to ask this question. ...Read more
Can you tell me the effects that a reduced cardiac output would have on the muscle cells of an athlete.?
Yes: When an athlete exercises to the point of their maximum cardiac output, their muscle cells convert from oxidative to anerobic metabolism with accumulation of Lactic Acid and development of oxygen debt - if CO is reduced, this will happen at a lower level of activity. Generally, one's days of competition are over. ...Read more
There are 3 types of: Muscle, skeletal-compose of our muscle mass attach to the skeleton; smooth-located in the walls of hollow visceral organs except the heart; cardiac or striated. In practice, the term is sometimes used to refer exclusively to cardiac when distinguishing it from smooth muscle. Other dictionaries called striated muscle to skeletal muscle. Good question! ...Read more
They would die...: Unlike skeletal muscle, which is generally used for short bursts of contraction, cardiac myocytes are specialized muscle cells that do not get "fatigued". That is because they are needed to continually be contracting, if they stopped, you would die. Lactic acidosis leads to muscle fatigue. In cardiac myocytes, hypoxia or low oxygen will, in fact, lead to cardiac lactic acidosis, e.g. Heart attack. ...Read more
Different: Cardiac muscle is different than skeletal muscle (arms, legs, back, etc). Skeletal muscle contracts when stimulated by the nerves that supply it. Heart muscle fires spontaneously as various electrolytes change concentration in the surrounding tissue. The area called the sinus node typically passes the threshold first thus firing the electrical impulse. This area is modulated by brain inputs. ...Read more
See below: The heart is a muscle with very special qualities. The main bulk of heart muscle helps pump blood to the lungs to get oxygen and then pumps that oxygen rich blood to the rest of the body. Then there is a special type of cardiac fibers that helps conduct electrical impulses from two "pacemaker" sites in the heart, the sa and av nodes which allow the heart to keep pumping for your entire life. ...Read more
Heart is a muscle.:
Cardiac muscle contracts and relaxes known as heart beats. This sends blood entering into the heart to flow out into major blood vessels; the thoracic aorta and the main pulmonary artery.
Blood from lungs enters heart via pulmonary veins and is pumped into the aorta delivering oxygen to body. Oxygen poor blood from body enters heart via vena cavae and pumped into lungs via pulmonary artery. ...Read more
Very complicated: This gets pretty nuanced! Contractility is a concept that refers to the inherent ability for heart muscle cells or the heart in general to develop a certain amount of force for the same given amount of stretch (preload) and load (afterload). Force of contraction is how hard the muscle or the heart is contracting no matter what the loading conditions are. ...Read more
I was wondering what are the differences between cardiac (heart) and skeletal muscle contractile tissue?
Cardiac vs Skeletal:
It is difficult to describe in this limited space. Refer to the site:
http://www. Differencebetween. Net/science/health/difference-between-cardiac-and-skeletal-muscle/. ...Read more
Adjusting bra in the front, felt an odd twisting sensation between breasts. No pain, just a little pull for a few seconds. Fear cardiac. Ideas? Muscle?
Symptom: Highly unlikely to be cardiac relatedGet a more detailed answer ›
Depends on K+...: Resting membrane potential is generated in phase 4, by k+ (potassium) ions. Na+ (sodium) channels are only active during phase 0 and are regulated by m, h and j gates. Because phase 4 is mainly controlled by k+ ions, the only way low or high na+ would affect this is in "ion homeostasis" (ih), via the n+/k+ pump. So if na+ was extremely high or low, and affected k+, it could potentially change it. ...Read more
Diagnosed with sle, cardiac profile test = ldh = 619 high, does it mean anything, have severe muscle weakness and fatigue.
Does sharp pain in my mid back and shoulders mean cardiac problems? The muscles hurt my back when I lift my arms. Neg cardiac test 1 yr ago. Anxiety?
No: Heart pain never hurts just the back and shoulders- it may radiate to the back when it starts in the chest and becomes severe. The observation that lifting your arms provokes it is a good indication that the pain is muscular (not nerves). Rest, heat, and analgesics (like ibuprofen) will most likely help. Avoid heavy lifting and try to maintain good posture (i.e. avoid spells of leaning forward) ...Read more
I have pain down my left leg and left arm. Doesn't feel like muscle pain. Pain started spontaneously. Worried that it might be circulatory or cardiac related. What could it be caused by?
Please repost: Please repost and explain 1) why you think this could be circulatory or cardiac in a (presumably) healthy 35-year-old man; and 2) what your doctor told you the pain could be; or, if you are concerned enough to post this but not concened enough to see a doctor about it, why not. ...Read more
Can muscle tightness cause shooting pain? Non cardiac shooting chest pain sometimes goes downwards into my stomach. Some in upper back as well.
Back trauma?: Shooting pain is often neuropathic pain, which is often associated with a secondary muscle spasm. (cardiac or noncardiac is open until the diagnosis is established!) neuropathic upper back and chest pain does happen (i.e., in thoracic nerve roots disease, aka radiculopathy), although it is not very common. If any history of back trauma, MRI of the thoracic spine may identify the cause. ...Read more
Chest pains localized Left side top of breast. Worse when pushed on. Shoulder sore and tight muscles around shoulder. Cardiac?
Your heart never grows tired because of cardiac muscle. Would your arms, legs, abdomen, etc never grow tired if they also had cardiac muscles?
See below: If your heart works too hard, it will tire, no matte what type of muscle fibers. ...Read more