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3 years ago

The cross bridge cycle is a series of molecular events that occur after excitation of the sarcolemma. What is a cross bridge?

Biology

1 answer:

Delvig [45]3 years ago

7 0

Answer:

The correct answer is C: a myosin head bound to actin.

Explanation:

The cross bridge cycle is a series of events that occur during muscle contraction. When muscle contracts, a myosin head (projected from a thick myosin filament) attaches to a thin actin filament <em>(this is the so-called cross bridge).</em> The thin filament also contains tropomyosin and troponin.

Then, a second myosin head binds to ATP and catalyzes it in presence of calcium. This step gives the muscle the energy to contract.

Without calcium, tropomyosin and troponin avoid myosin and actin to interact.

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3 years ago

Which of the following is an example of a force that acts at a distance?

Levart [38]

Answer:

3. a leaf falling off of a tree to the ground.

Explanation:

Force is given by the multiplication of mass and acceleration.

Mathematically, Force is;

$F = ma$

Where;

F represents force measured in Newton.

m represents the mass of an object measured in kilograms.

a represents acceleration measured in meters per seconds square.

Force can be categorized into two (2) main types; forces that at a distance and forces the act by direct contact with the body.

A force that acts at a distance refers to the force exerted on a body or an object without any physical contact between them such as gravitational force, magnetic force and electric force. This simply means that, there can be a push or pull between objects even when they are not in physical contact with each other due to gravitational, magnetic or electric forces.

<em>Some example of a force that acts at a distance is a leaf falling off of a tree to the ground, a magnet pulling an object to itself, a magnet pushing or repelling another magnet etc. </em>

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2 years ago