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Llana [10]
4 years ago
8

Beta-adrenergic blocking agents decrease the oxygen demands of the heart by what mechanism?A. Increasing cardiac output, thereby

increasing the oxygen supplied to the heartB. Increasing blood pressure, which increases the amount of blood returned to the heartC. Increasing conduction to the atrioventricular node, thereby increasing cardiac outputD. Decreasing the heart rate, allowing for longer filling time and increased blood to the heart
Biology
1 answer:
Alja [10]4 years ago
7 0

Answer:

option D

Explanation:

beta blockers usually decreases the blood pressure by inhibiting the release of  adrenaline also known as epinephrine hormone which have sympathetic effects on heart. Beta blockers works by slowing down the heart rate, so less oxygen is needed by heart to pump the blood and takes longer time in filling.

but beta blockers are not recommended in hypertension. and they are also not used in asthmatic patient as it can worsen the asthma.

You might be interested in
Products are what is created during a reaction. What are the three products of cellular respiration
Setler79 [48]

Answer:

The three products of cellular respiration are:

  1. ATP
  2. Water
  3. Carbon dioxide

Explanation:

  • Cellular respiration is the process of breaking down glucose molecules to yield energy in the form of ATP.
  • C6H12O6 + 6O2 → 6CO2 + 6H2O

ATP Production:

  • The first step of cellular respiration, glycolysis, yields 2 net ATP.
  • The second step, Kreb's cycle produces 10 NADH and 2 FADH2 molecules. Both these molecules store energy that is released in the electron transport chain to produce 34 ATP.
  • Therefore, a total of 36 ATP are produced as a result of cellular respiration in eukaryotes.

Carbon dioxide Production:

  • 2 molecules of CO2 are produced during the conversion of pyruvate into Acetyl Co-A by the <em>pyruvate dehydrogenase</em> complex.
  • 4 molecules of CO2 are produced in the Kreb's cycle.

Water Production:

  • Water is produced in the Electron Transport Chain (ETC) by the reduction of oxygen.

3 0
4 years ago
Plasma membrane proteins are inserted into the membrane in the ____er______________. the address information for protein sorting
svetlana [45]
A endoplasmic reticulum
B amino acid sequence
C folded
D sorting signal
E transport vasicles
F protein translocators
G unfolded
7 0
3 years ago
What process allows scientists to make unlimited amounts of DNA for testing?​
ElenaW [278]

Answer:

DNA cloning allows a copy of any specific part of a DNA or RNA sequence to be selected from the millions of other sequences in a cell and produced in unlimited amounts in pure form.

Hope this helps :)

6 0
3 years ago
According to the acid-growth hypothesis, auxin works by________.A. dissolving sieve plates, permitting more rapid transport of n
DIA [1.3K]

Answer:

The correct answer is D increasing the activity of protons pumps that lowers the pH  of the cell walls allowing cells to elongate.

Explanation:

The plant growth hormone auxin work by increasing the H+ ion concentration thus decreasing the pH of the apoplast.

    The decrease in the pH of the apoplast helps in the cell wall extension that ultimately result in cell growth.

   Auxin hormone exert this effect by increasing the activity of increasing the activity of proton pumps in the apoplastic membrane.

   

4 0
4 years ago
Need Help ASAP!!
anzhelika [568]

Questions:

1. Supporting all stakeholders means that?

A. any solution benefits for all stakeholders equally .

B. the solution favors human needs over environmental.

C. one stakeholder is supported by the expense of the others .

D. all needs are taken into account and solutions are designed to consider them all .

2. Technology is not likely to change the field of marine science much in the future. (1 point)

A. True

B. False

3. The national oceanic and Atmospheric administration use to buoys to monitor (1 point)

A. ship traffic

B. weather patterns via satellite

C. movement of tectonic plates

D. water conditions around coral reefs

4. The first echo sounder was used in a German submarine. (1 point)

A. True

B. False

5. Why are marine oceanographers particularly concerned with coastal regions? (1 point)

A. Coastal regions are highly impacted by human activity.

B. Previous studies in marine science have largely ignored them.

C. They are the only areas that marine oceanographers can access.

D. By definition, marine oceanographers are only concerned with the coast.

6. Most colleges with strong marine biology departments are located in coastal regions. (1 point)

A. True

B. False

7. One of the biggest challenges in exploring polar regions is (1 point)

A. ice packs

B. hurricanes

C. polar bears and walruses

D. lack of latitude and longitude

8. The purpose of global regulation of the ocean is (1 point)

A. to protect and preserve the ocean

B. to deny dangerous countries access

C. to ban militaries from using the ocean

D. to minimize the role of commercial fishing

9. How did American captain William Anderson eliminate the problem of ice packs when exploring the arctic? (1 point)

A. He designed the ship to melt the ice .

B. He went under the ice packs with a submarine.

C. He developed a particularity narrow ship.

D. He went when temperatures were warmer .

10. By definition, an inorganic element is (1 point)

A. not alive

B. microscopic

C. in the ocean

D. immune to change

11. What does an echo sounder do? (1 point)

A. allows divers to better hear underwater

B. uses sound waves to map the ocean floor

C. documents sound at the deepest region of the ocean

D. eliminates all echos when divers are communicating underwater

12. There is one established method to solve all scientific problems. (1 point)

A. True

B. False

13. Regardless of the scientific question being asked, scientific research will include all of the following EXCEPT? (1 point)

A. use of the scientific method

B. a single approach in every situation

C. exploration of work by previous scientists

D. sharing results with the scientific community

14. Positive feedback in a system is (1 point)

A. words of praise

B. a benefit for the entire system

C. an interaction that benefits one element

D. an event that benefits one part while weakening another

15. What does the international ocean drilling program do? (1 point)

A. collects samples from the sea floor

B. advocates ending all drilling on the floor

C. determines international regulations for offshore drilling

D. searches the sea floor for the location of underground oil

Answers & Explanation

1. D. all needs are taken into account and solutions are designed to consider them all .

2. B. False

3. D. Water conditions around coral reefs

4. A. True

5. A. Coastal regions are highly impacted by human activity.

6. A. True

7. A. ice packs

8. A. to protect and preserve the ocean

9. B. He went under the ice packs with a submarine.

10. A. not alive

11. B. uses sound waves to map the ocean floor

12. B. False

13. B. a single approach in every situation

14. C. an interaction that benefits one element

15. A. collects samples from the sea floor

The final score is a 15/15 (100%)

7 0
3 years ago
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