Not sure if what I put for the 3a is correct. And I have no idea on how to do pa

Question

Not sure if what I put for the 3a is correct. And I have no idea on how to do part-b. Please help, I will upvote for correct answers.

3a. (2pts) Fill in the blanks with ‘increase’ or ‘decrease’. (Assume other parameters do not change.)

            Decreasing the heart rate will __Decrease_______ end diastolic volume.

            Increasing blood pressure will __increase_ end diastolic volume and __decrease__ end systolic volume.

            Decreasing the heart rate will _decrease________ cardiac output.

3b. (3pts) Are the smooth muscle features below more like Skeletal muscle, Cardiac muscle or Unique to smooth muscle?

__U__ do not possess sarcomeres

____ use motor units to control contraction

____ possess gap junctions for coordinated contraction

____ use calmodulin and myosin light chain kinase to start the cross bridge cycle

____ promote contraction through influx of Ca2+ across the plasma membrane

____ can contract without electrical depolarization of the plasma membrane

Explanation / Answer

3a) Decreasing the heart rate will increasee the end diastolic volume. Increasing the blood pressure will increase the end distolic volume and decrease the end systolic volume. Decreasing the heart rate will decrease the cardiac output.

3b) Do not possess sarcomere - unique to smooth muscle

Use motor units to control contraction - like skeletal muscle

Possess gap junctions for coordinated contraction - like cardiac muscle

Use calmodulin and myosin light chain kinase to start the cross bridge - like skeletal muscle

Promote contraction through influx of calcium across the plasma membrane - like skeletal muscle

Can contract without electrical depolarization of the plasma membrane - like cardiac muscle

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