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
Varvara68 [4.7K]
3 years ago
14

When the atria contract, which of the following is true? a. The AV valves are closed. b. The ventricles are in diastole. c. The

atria are in diastole. d. The semilunar valves are open.
Biology
1 answer:
gizmo_the_mogwai [7]3 years ago
5 0

Answer:

b. The ventricles are in diastole.

Explanation:

Atrial systole is the phase of the cardiac cycle that lasts for about 0.1 sec. During this phase, the atria are contracting. At the same time, the ventricles are relaxed or are in diastole. The pressure of the contraction of atria forces the blood to open the AV valves. The blood enters the ventricles through the open AV valves. During this phase, the semilunar valves are closed as the blood pressure in ventricles is very low. The P wave of ECG represents the atrial systole. This is followed by the systole of ventricles.

You might be interested in
Pleaaase help , and show work if you can
charle [14.2K]

Answer:

1. 39 J; 2. 3.9 % usable; 3. 96.1 % unusable

Step-by-step explanation:

1. Available energy

Energy consumed              = 1000 J

Less waste         = - 177 J

Less respiration = <u>-784 J </u>

Total energy lost                = <u>-961 J </u>

Available energy                =   39 J

2. Percent of total energy usable

The chipmunk could use only 39 J of the original 1000 J.

% of energy usable = 39 J/1000 J × 100 % = 3.9 %

3. Percent of energy unusable

The chipmunk lost 961 J of the original 1000 J.

% of energy unusable = 961 J/1000 J × 100 % = 96.1 %

6 0
3 years ago
Which of these methods is NOT solely applicable to biological classifications?
zvonat [6]
B. Cladistics, because the other two choices don't make any sense.
8 0
3 years ago
Read 2 more answers
The magnification of the signal from a water-soluble hormone is achieved through an increase in _______.
gogolik [260]

cAMP in the cytoplasm

Many cAMP can be generated as a second messenger to amplify the signal in response to hormone binding.

7 0
3 years ago
Read 2 more answers
Someone please answer this question, just one 1 question
Igoryamba
Sorry but I can’t do that I have a I pad with a broken leg
4 0
3 years ago
Read 2 more answers
Are sperm protected from drying out in ferns? what are the consequences of this
Grace [21]
The tube will be block and then it will get clogged up not letting sperm travel through anymore
8 0
3 years ago
Other questions:
  • A cell is classified as eukaryotic if the cell
    7·1 answer
  • What are the characteristic of the domain bacteria?
    12·1 answer
  • Does the price per bushel always increase with demand
    14·1 answer
  • True or false: When a population exceeds the varying capacity a sudden population decline can be expected
    6·2 answers
  • If earth was like a hard boild egg which part would the egg shell represent and why?
    9·2 answers
  • Could you find the genotype and phenotype of the parents of three children that have blue eyes?
    5·1 answer
  • During protein synthesis which part of RNA is joined together to form a sequence for a functional protein? Exons, introns, both
    10·2 answers
  • Why is cellular respiration called an aerobic process
    11·1 answer
  • Identify the longitudinal section of a long bone and interior bone structure.
    8·1 answer
  • Coffee and cocoa taste bitter because they contain what
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!