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Veseljchak [2.6K]
3 years ago
7

Which statement describes two organ systems working together to make an

Biology
2 answers:
xenn [34]3 years ago
7 0

Answer:

c

Explanation:

krek1111 [17]3 years ago
7 0

Answer:

C

Explanation:

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Which three scientists directly contributed evidences for the cell theory?
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The three scientist are Matthias Schleiden<span>, </span>Theodor Schwann<span>, </span>Rudolph Virchow<span> 4.
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3 years ago
what is the defining characteristic of eukaryotic cells? what types of organisms have eukaryotic cells?
solniwko [45]

Answer: What is the defining characteristic of eukaryotic cells? Put these in your own words.

Eukaryotic cells are defined by the presence of a nucleus containing the DNA genome and bound by a nuclear membrane (or nuclear envelope) composed of two lipid bilayers that regulate transport of materials into and out of the nucleus through nuclear pores.

What types of organisms have eukaryotic cells?

There is a wide range of eukaryotic organisms, including all animals, plants, fungi, and protists, as well as most algae. Eukaryotes may be either single-celled or multicellular.

4 0
3 years ago
In fast-twitch oxidative-glycolytic fibers, their rapid increases in force rely on the ________ activity where rapid relaxation
Kitty [74]

Answer:

1. myosin ATPase

2. Ca2+-ATPase

Explanation:

ATPase activity of myosin head hydrolysis ATP and energize the myosin head. The energized myosin head forms cross bridges to facilitate the power stroke of muscle contraction. The fast-twitch oxidative-glycolytic fibers have the ability to produce ATP by aerobic respiration.  

These fibers have the  ATPase in their myosin heads that hydrolyze ATP three to five times faster than the myosin ATPase in slow fibers. This ensures the faster speed of contraction of these fast-twitch muscle fibers.

During their relaxation, Ca2+ ATPase pumps the calcium ions back to the sarcoplasmic reticulum. As the level of Ca2+ ions in the sarcoplasm decreases, calcium ions are released from troponin. Tropomyosin is allowed to cover the myosin-binding sites on actin and the muscle fiber relaxes faster.

4 0
3 years ago
With the proper stimuli, chemoreceptors and mechanoreceptors are depolarized. This is a result of:Sodium channels opening as a r
Alex73 [517]
<h2>Sodium channels </h2>

Explanation:

Depolarization is a result of sodium channels opening as a result of chemical or pressure-based stimuli    

  • Depolarization starts when a threshold stimulus applied on a neuron via Na+ mechanically operated channels that trigger action potential
  • Action potential is an efficient signaling process by which distantly located cells communicate to each other
  • Depolarization of membrane potential is due to influx of Na+ via voltage gated Na+ channels
  • Fast opening of voltage gated Na+ channel shifts membrane potential from -70mV to + 50mV at which voltage gated Na+ channels become inactive thus influx of Na+ abruptly stops        
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3 years ago
The four types of macromolecules in cells are nucleic_________<br> lipids, proteins, and_____
brilliants [131]

The four types of macromolecules in cells are nucleic acids, lipids, proteins, and carbohydrates.

8 0
3 years ago
Read 2 more answers
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