Why does the gastrocnemius muscle contract after stimulating the sciatic nerve?

When stimulating the gastrocnemius muscle What happens to the number of fibers producing action potentials as we increase voltage?

Terms in this set (18) The sciatic nerve is a bundle of nerve fibers. If you stimulated the nerve, what would happen to the number of fibers producing action potentials as you increased the voltage? The number of fibers producing action potentials would also increase because more voltage gated channels would open.

What difference did you observe in fatigue when stimulating the nerve and stimulating the muscle directly?

Muscle fatigue is defined as a decrease in maximal force or power production in response to contractile activity. The reason why we determined that it is muscle fatigue is because of the minimal difference between the fatigue rate of the via nerve and muscle stimulation.

What is the function of the sciatic artery in a frog?

Femoral artery: it supplies blood to hip and thigh. Sciatic artery: it supplies blood to lower region of hind legs.

What is nerve muscle preparation of frog?

Background. The frog muscle-nerve preparation was a popular experimental tool that was used in India to teach skeletal muscle physiology till 1997 (2). Until then, undergraduate medical students had to make the preparation and perform experiments to demonstrate the properties of skeletal muscle.

What happens when sciatic nerve is stimulated?

In conclusion, the results of this study have shown that the electrical stimulation of sciatic nerve accelerates nerve repair and indirectly improves BF muscle force to a comparable level with control without effect on muscle sensitivity.

What is the function of the gastrocnemius muscle?

Function. The gastrocnemius with the soleus, is the main plantarflexor of the ankle joint. The muscle is also a powerful knee flexor. It is not able to exert full power at both joints simultaneously, for example when the knee is flexed, gastrocnemius is unable to generate as much force at the ankle.

How is the sciatic nerve dissected from a frog’s leg?

Glass probes are used to dissect out the frog sciatic nerve, by gently separating the nerve from the surrounding muscle masses. Great care must be taken when freeing the nerve from tendons at the hip and knee joints.

What is the conduction velocity of sciatic nerve frog?

Abstract. A comparison of regenerated and normal frog sciatic nerves showed a marked reduction in conduction velocity from 37.5 to 15.2 m/s with little change in the absolute refractory period. Changes in conduction velocity corresponded to a reduced mean axon caliber (4.8 versus 6.6 micron).

What’s the main artery called?


The main artery is your aorta, which connects to the left side of your heart. It runs down through your chest, diaphragm and abdomen, branching off in many areas. Near your pelvis, your aorta branches into two arteries that supply blood to your lower body and legs. The main vein in your body is the vena cava.

What muscles does the sciatic nerve innervate?

The undivided sciatic nerve innervates the 4 hamstring muscles and the short head of the biceps femoris muscle along the back of the thigh. The nerve also partially supplies the adductor magnus muscle along the inner front side of the thigh.

Can sciatica cause calf muscle atrophy?

Patients who suffer from sciatica are at risk for developing muscle atrophy. A recent British study found that patients with sciatica had decreased muscle mass, also known as muscle atrophy.

Is the sciatic nerve motor or sensory?

The sciatic nerve extends from the lower back to the foot and is a mixed nerve, which means it has both motor and sensory fibers. These fibers provide sensation and function in the lower limbs.

Does the sciatic nerve affect the calf?

Classic sciatic pain starts in the low back and buttocks. It affects one leg traveling down the back of the thigh, past the knee, and sometimes into the calf and foot. The pain feels worse in the leg than in the back.

What nerve controls the calf muscle?

tibial nerve

The tibial nerve (S1, S2) innervates the majority of the muscles of the calf. The tibial nerve passes through the popliteal fossa and gives off branches to the gastrocnemius, popliteus, soleus, and plantaris muscles.

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