Answer:A. The release of calcium ions causes myosin and actin to attach to each other.
The contraction of skeletal muscles takes place by induction of a nerve impulse, which produces a movement and the interaction of the filaments containing proteins named as actin and myosin. This interaction of filaments is regulated by proteins called tropomyosin and troponin present on the actin filaments. The motor nerve causes the depolarization of the muscle membrane sarcolemma. This triggers the sarcoplasmic reticulum to release calcium ions. This calcium binds to troponin and thus allows the tropomyosine strand on the actin filament to displace so that the part of the actin where myosine head needs to be attached remain uncovered. Binding of the actin myosine filament results in contraction.
Hence, the release of calcium ions causes myosin and actin to attach to each other causes muscle contraction.
The most skin receptors are present in the fingers.
Adaptation, inherited traits that increase an organism's chance of survival, also determine an organism's niche.
Adaptations are features or behaviors exhibited by organisms and are usually common in a population. Adaptations evolve by natural selection and they fit organisms to their environment. Adaptations have functional roles and may be physiological, structural or behavioral. The long necks of giraffes for feeding in the tops of trees, and the long canine teeth of carnivores are examples of adaptation.
A. do so on membranes called thylakoids.
In the conversion of glucose to pyruvate, one step of the actual steps involves electron transfer. The correct option is B.
<h3>What is glycolysis?</h3>
Glycolysis is the method of breaking glucose to produce energy. It generates two pyruvate molecules, ATP, NADH, and water. The process occurs in a cell's cytoplasm and can take place in aerobic or anaerobic organisms.
It can occur even without oxygen. During glycolysis, glucose is broken down into pyruvate and energy, yielding a total of two ATP. One of the actual steps in the conversion of glucose to pyruvate involves electron transfer.
Thus, the correct option is B, it involves one step.
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Your question seems incomplete, the missing options are:
A. none. B. 1. C. 2. D. 3. E. 4.
