When an external stimulus crosses the threshold, a muscle fibre will respond.
<h3>The level of the threshold</h3>
- For the identification of the electrical activity carried out by the active muscles, the threshold level is a crucial consideration.
- A portion of the electrical activity carried out by the target muscles may be excluded if the chosen threshold level is higher than the overall activity.
<h3>What is the stimulus threshold for muscle contraction?</h3>
- A certain stimulus magnitude is necessary for muscle contraction.
- The threshold stimulus is the smallest amount of force needed for a stimulus to cause a muscle to contract in response.
- If the stimulus intensity is less than this threshold value, there is no response.
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Bird migrations began with the recession of the glaciers during the ice age. You will notice a great increase in insects in the spring time and early summer.The birds moved North to take advantage of this increase in the food supply that followed the warming in the spring and early summer. Their reproductive organs temporarily developed so they could lay eggs and raise a family. Look at the early flush of Night crawlers in the moist times of the early rains. By mid summer most of the insects have matured, mated and died. Their eggs have hatched and turned to larva and moved underground until next spring. The shortening of the days causes the reproductive functions to decrease and signals the birds that the food will soon become scarce. They move back to the area that makes it the easiest to find food and avoid freezing. which of course is the warmer climates nearer the equator. Not all birds move past the Tropics at approximately 30 degrees. Some like Chickadees may move down from Mi or Mn or Canada only as far south as Indiana. Some migrations may be quite short. For example from the mountains down to the plains. They don't generally reproduce in the warmer winter climes they migrate to. In the spring time they migrate along paths of the retreating glaciers. As the climate warms away from the tropics the birds follow the emerging insects etc to the birds selected breeding grounds.with increased insects and longer days to feed the hatching's. It is necesary to understand why they move to cooler climates in the summer to under stand why they move to eh warmer ones in the fall. As the days shorten the food supply dwindles and the babies have fledged. They move to warmer climates in winter to rest and refuel for the next years migration.
Warm fronts
Not cold fronts because those move to warm
An autopsy includes an examination of all body systems as the suspected cause of death may be inaccurate. Everything should be analyzed in case there is a medical problem anywhere in the body that may have caused the death.
To know the full story of death you have to watch it all. Autopsy also called postmortem examination or autopsy is the dissection and examination of a cadaver and its organs and structures. An autopsy, or necropsy, has been the gold standard for discovering the cause of death and examining disease in this regard for centuries.
An autopsy may be performed to determine the cause of death observe the effects of the disease and determine the course and mechanism of the disease. The exact nature of a death can be difficult to prove how it happened. Visible evidence of how the death occurred is not always necessary and can be used as a diagnostic tool. No medical history is required.
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Answer:
The circulatory system comprises of blood vessels which help in removing carbon dioxide from the body. The carbon dioxide produced by the cells is collected by the capillaries where the carbon dioxide gets dissolved in the blood. This blood is carried to the heart via the veins. The heart pumps the deoxygenated blood to the lungs where gaseous exchange occurs between the blood capillaries and the alveoli of the lungs. When we exhale, the carbon dioxide is breathed out.
