Answer:
B. In skeletal muscle, calcium initiates contraction by binding to troponin, while in smooth muscle calcium initiates contraction by binding to calmodulin.
Explanation:
The Calcium ions (Ca2 +) have a key role in skeletal muscle contraction. Moreover, the Troponins are regulatory proteins that also play roles in skeletal contraction. In this muscle, troponin is attached to tropomyosin, when Ca2 + binds to troponin it induces a conformational change, thereby exposing this protein to its binding to myosin filaments on the actin filaments, which initiates muscle contraction.
On the other hand, calmodulin (calcium-modulated protein) is a protein which mediates the contractile state of the smooth muscle by binding Ca2+ ions. The function of this protein is to stimulate the development of force (contraction) in response to Ca2+ ions by activating the phosphorylation of myosin.
The layer of atmosphere near the surface of the earth is the troposphere and the other layers are above the earth atmosphere these are mesosphere, and stratosphere.
- The troposphere is suitable for flying of the birds as the temperature is suitable for their survival but layers of the mesosphere and stratosphere have lower temperature than the troposphere.
- Nearly all water vapor and dust particles are present in the tropospheric layer but the quantity reduces in the mesosphere and stratosphere.
Learn more about atmosphere:
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The red blood cels becaus ethey transport everything in the body\
Answer:
Effort = 125 N
Explanation:
Given
Load (L) = 500 N
Load distance (L.D) = 20 m
Effort distance (E. D) = 80 m
Effort (E) = ?
We have the formula that
E * E.D = L * L. D
E * 80 = 500 * 20
80E = 10000
E = 10000/80
E = 125 N