Which best describes the top and bottom images of muscle contraction?

Biology

1 answer:

erastova [34]2 years ago

6 0

The ribht answer is a.

* Muscle contraction results from the coordinated contraction of each of the muscle cells.

There are four phases during the contraction of a "typical" muscle cell:

- the excitation or the stimulation which corresponds to the arrival of the nervous message on the muscular fiber;

- the excitation-contraction coupling which groups together all the processes making it possible to transform the nerve signal received by the cell into an intracellular signal towards the contractile fibers;

- the contraction itself;

- the relaxation which is the return of the muscular cell to the state of physiological rest.

* There are two types of muscle contraction:

isometric contraction when the length of the muscle does not change when contracting (supports a load);

anisometric contraction (or isotonic) when there is a change in the length of the muscle, with a rapprochement of the points of insertion of the muscles it is concentric and eccentric when these move away;

You might be interested in

The coelacanth fish looks very similar to its fossil ancestors from 300 million years ago. Which of the following statements exp

Vadim26 [7]

It was affected by natural selection.

If this is wrong someone please tell me.

6 0

2 years ago

Read 2 more answers

The plasma proteins involved in fighting infections are

NeTakaya

Plasma proteins account at least 8% of the plasma, they contribute to osmotic pressure and maintain water balance in blood and tissues, other functions includes transport and enzymatic activities. Plasma proteins include albumin, fibrinogen and globulin (alpha, beta and gamma). Globulin proteins may be used to fight infections such that gamma globulin antibodies are released by the plasma during immune response.

5 0

2 years ago

Which of the following statements is true regarding the complexity of biological systems

Leto [7]

The correct answer is option B

Biological systems can be defined as the complex system in which the function of a component is dependent on the functioning of the other components. By knowing the function of each component one can get an insight into the structure and organization of the living system. The different components of the biological systems are interconnected and they function accordingly.

7 0

2 years ago

Read 2 more answers

The central dogma describes how the genes in the nucleus work to produce an organism's phenotype. another way of putting it is t

77julia77 [94]

Due to the definition of the central dogma, another way of putting it is that the central dogma follows the flow of information from DNA to protein.

7 0

2 years ago

Daniel is studying feeding relationships in a neighborhood pond. He observes several organisms that feed on one another, and he

vichka [17]

So given the suggested food chain of algae-snail-sunfish-heron we can conclude that this food chain is heavily dependent on the process of photosynthesis.

The algae is the only of the organism that are directly dependent of the photosynthesis for their survival, while the snail, sunfish, and heron, and indirectly dependent on it.

Since we are talking about a food chain, in essence it means that all organism are connected through one another. So the algae perform photosynthesis for its own survival, the snail is using the algae is a food source, the snail is later eaten by the sunfish, and the sunfish goes on the menu of the heron.

If the algae, by some scenario, are not able to perform photosynthesis, than they will die off, and if they die off, than the snail will die off because of lack of food, if the snail dies off, along with it dies off the sunfish because of lack of food, and if the sunfish is out of the scene, the heron goes as well.

So we can conclude that the process of photosynthesis is of crucial importance for the survival of all four species, be it directly or indirectly.

6 0

2 years ago