1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Murljashka [212]
4 years ago
10

The force of contraction (of the heart) can be changed by:

Social Studies
1 answer:
Dmitry [639]4 years ago
8 0

The correct answer is letter A

Sinoatrial node (SA) or pacemaker or sino-atrial node: special region of the heart, which controls the heart rate. It is located near the junction between the right atrium and the superior vena cava and consists of a cluster of specialized muscle cells. The rhythmic frequency of these muscle fibers is approximately 72 contractions per minute, while the atrial muscle contracts about 60 times per minute and the ventricular muscle, about 20 times per minute. Due to the fact that the sinoatrial node has a faster rhythmic frequency in relation to the other parts of the heart, the impulses originating from it spread to the atria and ventricles, stimulating these areas so quickly, so that the rhythm of the SA node becomes the rhythm of the whole heart; that's why it's called a pacemaker.

You might be interested in
Which country's university is better for Chinese student?
Phoenix [80]
United States of America of course!
4 0
3 years ago
A cash advance is when cardholders borrow money _____. A. with their debit card B. from their bank C. against their overdraft D.
soldier1979 [14.2K]

Answer:

B

Explanation:

A cash advance is a service provided by most credit card and charge card issuers. The service allows cardholders to withdraw cash, either through an ATM or over the counter at a bank or other financial agency, up to a certain limit.

6 0
3 years ago
Informing an individual to all available options and continuing to personalize the risks of their current behaviors occurs durin
Marat540 [252]

Answer:

Contemplation.

Explanation:

Making a sustainable behavioral change is a complex process, and usually involves a considerable commitment of time, energy, and emotion. Psychologists have introduced a number of helping individuals change their behavior effectively and one of the best approaches to behavioral change is explained in the Stages of Change or Transtheoretical Model. Contemplation is the second stage of this model where people are more aware of the positives effects of changing but they are also acutely aware of the drawbacks. This tension is creating a strong sense of ambivalence over the transition.

6 0
3 years ago
How can writers use pictures on the Internet for inspiration?
Vinil7 [7]
I would say C. Good luck!
7 0
3 years ago
Read 2 more answers
Which word in this sentence should be capitalized?
sergij07 [2.7K]
Hey there,
In English capitalisation occurs when when the word is the first word in a sentence or it’s a name.
In this case the answer should be the word “is”.
This is because “is” is the first word in the sentence.

Hope this helps!!
6 0
3 years ago
Read 2 more answers
Other questions:
  • The principle of cooperative federalism means that the state governments work with _____ to develop national policies.
    12·2 answers
  • Which fact best supports the hypothesis of one common ancestor for all life?
    8·1 answer
  • Describe the hypothesis of Continental Drift and list three criteria used to support the hypothesis? ​
    9·1 answer
  • What people presented the world with ideas for trail by jury, democracy, Olympics and much more?
    6·1 answer
  • Which of the following best describes the type of democracy that exist in the United States?
    14·2 answers
  • What are the impacts of unequal behaviour in the society? mention .​
    7·1 answer
  • The head of the executive branch is ____.
    9·1 answer
  • ¿Cómo determinas el índice de masa corporal?<br> AYUDAAAASAAaAaaAaAA<br> ;-;
    15·1 answer
  • France and britain were thinking about ethnic or religious differences when they created the borders. What were they interested
    9·1 answer
  • Who are the most common victims of murder and other violebt crimes in united?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!