Atrial Contractions

fallen*angel asked:


Which waves on the ECG show precisely atrial and ventricular contraction? I know what each wave stand like for, like the P wave for atrial depolarisation, QRS ventricular depolarisation etc. I just can’t think whether contraction actually happens during depolarisation or after depolarisation?

Thanks!

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** asked:


I have tried my best looking in the book and on the internet but I cannot find anything. I have a worksheet on the heart, and I need help.
What is the valve that permits blood flow from the right ventricle into the pulmonary artery called?
(A. Mitral B. Tricuspid C. Pulmonary semilunar D. Aortic semilunar)… is it tricuspid valve?
Which of the following events, if any, does not preced contraction?
(A. Atrial depolarization B. P Wave C. Ventrical depolarization D. all of the above)
Ventricular contraction of the heart occurs immediately after depolarization of which of the following?
(A. Sinoatrial node B. bundle of His C. Purkinje fibers D. Atrioventricular nod) What do they mean by depolarization?

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htowncutie007 asked:


ok so im trying to study for my bio quiz and i answered some multiple choice questions at the end of the chapter. can someone just tell me if i got it wrong and if i did what is the right answer? thank you! i already know the 1st one is correct so i wont post it.

2.) Which type of glands are ductless? (b)
a. exocrine
b. endocrine
c. Both a and b are correct
d. neither a nor b is correct

3.) Which hormones can cross cell membranes? (b)
a. peptide hormones
b. steroid hormones
c. both a and b are correct
d. neither a nor b is correct

4.) The anterior pituitary controls the secretion(s) of: (b)
a. both the adrenal medulla and the adrenal cortex
b. both thyroid and adrenal cortex
c. both ovaries and testes
d. both b and c are correct

5.) Growth hormone is produced by the (c)
a. posterior adrenal gland
b. posterior pituitary
c. anterior pituitary
d. kidneys
e. none of these are correct

6.) ____ is released through positive feedback and causes ____: (c)
a. insulin, stomach contractions
b. oxytocin, stomach contractions
c. oxytocin, uterine contractions
d. none of these are correct

7.) PTH causes the blood levels of calcium to ____, and calcitonin causes it to ____: (b)
a. increase, increase
b. increase, decrease
c. decrease, increase
d. decrease, decrease

8.) Bodily response to stress includes: (e)
a. water reabsorption by the kidneys
b. blood pressure increase
c. heart rate increase
e. all of these are correct

9.) Anabolic steroid use can cause: (e)
a. liver damage
b. severe acne
c. balding
d. reduced testicular size
e. all of these are correct

10.) Lack of aldosterone will cause a blood imbalance of: (b)
a. sodium
b. potassium
c. water
d. all of these are correct
e. none of these are correct

11.) Glucagon causes: (d)
a. use of fat for energy
b. kidney disease
c. all of these are correct
d. Both a and be are correct
e. none of these are correct

12.) Long-term complications of diabetes incude: (d)
a. blindness
b. kidney disease
c. circulatory disorders
d. all of these are correct (blindness, kidney disease, circulatory disorders)

13.) Diabetes mellitus is associated with (b)
a. too much insulin in the blood
b. too high a blood glucose level.
c. blood that is too dilute
d. all of these are correct

14.) Which of these is not a pair of antagonistic hormones? (c)
a. insulin- glucagon
b. calcitonin- parathyroid hormone
c. cortisol- epinephrine
d. aldosterone- atrial natriuretic hormone (ANH)

15.) Which hormone and condition is mismatched? (d)
a. growth hormone- acromegaly
b. thyroxine- goiter
c. parathyroid hormone- tetany
d. cortisol- myxedema
e. insulin- diabetes

thank you so much to whoever helps!
the answers i chose were in the ( ) right after the question. but don’t worry about it i already took the quiz, thanks!

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asked:


Which of the following best describes the composition of the middle layer of an arterial wall?
smooth muscle
stratified squamous epithelium
skeletal muscle
dense fibrous connective tissue

The electrical impulses through the heart show where the contraction of myocardium is about to take place. Which is the correct pairing of the electrical signal with the activity in the appropriate region of the heart?
P wave; atrial systole
QRS wave; ventricular systole
T wave; ventricular diastole
All of the choices are correct.

Which type of T cell directs the immune response?
helper T cell
suppressor T cell
cytotoxic T cell
memory T cell
T lymphocyte

Which of these is specifically responsible for antibody-mediated immunity?
T cells
B cells
platelets
All of the choices are correct.

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Ashley asked:


A to cause atrial contractions
B.to act as a pacemaker and inatiate the heartbeat
C. to prevent valves from intervting durning the heart beat
D. to conduct impules from the Av node to the ventricles

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bluntastic1421 asked:


PLEASE ANSWER EVEN IF U KNOW ONE OF THEM THANK U!

1)In tubuloglomerular feedback , an increase in glomerular filtration rate would increase the _____, thereby stimulating the release of a paracrine factor from the macula densa that would_____.

a)Afferent arteriolar pressure: constrict the afferent arteriole
b)Afferent artiolar pressue: increase filtrate flow
c)Flow of tubular fluid : constrict the efferent arteriole
d)Flow of tubular fluid : constrict the afferent arteriole.

2) The contraction of the diaphragm results in a(n) ________
a)Decrease in the volume of the thoracic cavity and therefore a decrease in atmospheric pressure.
b)Decrease in the volume of the thoracic cavity and therefore a decrease in intra-alveolar pressure.
c)Increase in the volume of the thoracic cavity and therefore a decrease in intra-alveolar pressure.
d)None of above.

3) The mechanism that establishes the medullary osmotic gradient depends most on the permeability properties of the____
a)Glomerular filtration membrane
b)Collecting duct
c)Loop of Henle
d)Distal convoluted tube.

4) A diuretic agent, such as Lasix, works by which of the following mechanisms?
a)To prevent pH changes caused by organic acid.
b)To enhance atrial contractions.
c)To reduce blood pressure and blood volume by inhibiting sodium and water retention
d)To activate the renin-angiotensin mechanism.

5) Interferons ____
a)Act by increasing the rate of cell division
b)Interefere with viral replication within cells
c)Are virus specific, so that an interferon produced against one virus could not protect cells against another virus.
d)Are routinely used in nasal sprays for the common cold.

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Aaron U. asked:


Usually Warfarin is administered to thin the blood during an episode of AF (to prevent a stroke). But I also read that aspirin can be a safer alternative. I inquiry about this, because I have mitral valve prolapse, and suffer from pretty frequent premature atrial contractions, and they sometimes make my heart jump right into a full blown fit of atrial fibrillation. Makes me *cringe* with uneasiness and discomfort from all the chaos taking place in my heart. Anyways, I would rather take aspirin than Warfarin, if possible. Coupled with my beta blocker (60mg Propranolol). Good or bad idea?

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Jenzy asked:


I had an EKG a few months ago and my doc said everything was fine. I’ve been having problems with dizziness, shortness of breath, fatigue and a decrease in appetite. This has been persistent for almost 1 and a half years now and seems to be worsening. my doc who stated, ” everything is normal” also called me by the wrong name during 2 seperate visits, so I decided to get my own med records myself and take a peek. Turns out, one of the tests were not read yet and the other findings were, “mild tricuspid regurgitation with premature atrial and ventricular contractions noted. Clinical correlation recommended.” i thought of the possibility of blood pressure being part of the culprit for my feeling so blah, so I got a monitor and found that my B/P fluctuates daily between 155/79 - 90/50 and my heart rate has been as high as 115 BPM and as low as 54 BPM. Is this something that is normal and what does the term, “clinical correlation recommended’ mean. BTW, my doc is no longer in business.

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ineedhelp asked:


The electrical impulses through the heart show where the contraction of myocardium is about to take place. Which is the correct pairing of the electrical signal with the activity in the appropriate region of the heart?

1. P wave; atrial systole
2. QRS wave; ventricular systole
3. T wave; ventricular diastole
4 All of the choices are correct.

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bluntastic1421 asked:


1)In tubuloglomerular feedback , an increase in glomerular filtration rate would increase the _____, thereby stimulating the release of a paracrine factor from the macula densa that would_____.

a)Afferent arteriolar pressure: constrict the afferent arteriole
b)Afferent artiolar pressue: increase filtrate flow
c)Flow of tubular fluid : constrict the efferent arteriole
d)Flow of tubular fluid : constrict the afferent arteriole.

2) The contraction of the diaphragm results in a(n) ________
a)Decrease in the volume of the thoracic cavity and therefore a decrease in atmospheric pressure.
b)Decrease in the volume of the thoracic cavity and therefore a decrease in intra-alveolar pressure.
c)Increase in the volume of the thoracic cavity and therefore a decrease in intra-alveolar pressure.
d)None of above.

3) The mechanism that establishes the medullary osmotic gradient depends most on the permeability properties of the____
a)Glomerular filtration membrane
b)Collecting duct
c)Loop of Henle
d)Distal convoluted tube.

4) A diuretic agent, such as Lasix, works by which of the following mechanisms?
a)To prevent pH changes caused by organic acid.
b)To enhance atrial contractions.
c)To reduce blood pressure and blood volume by inhibiting sodium and water retention
d)To activate the renin-angiotensin mechanism.

5) Interferons ____
a)Act by increasing the rate of cell division
b)Interefere with viral replication within cells
c)Are virus specific, so that an interferon produced against one virus could not protect cells against another virus.
d)Are routinely used in nasal sprays for the common cold.

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