Answer:
by the sarcoplasmic reticulum's calcium ion pumps
Explanation:
Rigor mortis or postmortem rigidity, is a state caused by chemical changes in the muscles that occur post mortem and cause the limbs of the corpse to stiffen.
This occurs because after death, there is no cellular respiration and consequently, no oxygen nor ATP (ATP is required for the muscle relaxation).
Calcium enters the cytosol after death because it is released due to the deterioration of the sarcoplasmic reticulum and due to the breakdown of the sarcolemma. Ca2+ ions activate the formation of actin-myosin cross-bridging necessary for the contraction. Muscles are unable to relax, because myosin heads continue to bind with the active sites of actin and there is no ATP to destabilize the myosin-actin bond.
Instincts are the biologically determined, innate patterns of behavior.
Instincts are the intuitive feeling of a person towards a certain stimuli. These are inborn impulses. There are 6 basic human instincts. These are seeking, anger, fear, panic-grief, care, pleasure and play. Amongst all, seeking is considered to be the most powerful instinct.
Innate behavior is the habit that is present inside an organism by birth, may be genetically. No prior learning or experience is required for it. Examples of the same are: reflexes, taxis and kinesis, fixed action patterns and circadian rhythms. When a baby suckles after birth, it is an innate behavior.
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During mitosis, cells replicate all their contents, including chromosomes, and divide to form two identical daughter cells.
<h3>What is Mitosis?</h3>
Mitosis is the process by which one cell divides into her two identical daughter cells (cell division).
- During mitosis, the cell divides once to form two identical cells.
- The main purpose of mitosis is to grow and replace worn-out cells.
- Mistakes made during mitosis, if not corrected in time, can lead to DNA changes that can potentially lead to genetic diseases.
Mitosis is divided into following phases:
- Interphase
- Prophase
- Metaphase
- Anaphase
- Telophase
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D)Heat within Earth
Explanation:
The heat from within the earth is as a result of plate tectonics. Plates on the earth are driven by heat within the earth through convection currents.
- Plate tectonics suggests that the earth are broken into slabs that moves on the weak and ductile material called asthenosphere.
- Heat from within the earth causes the melting of asthenosphere.
- The riding lithosphere which is cold will sink into the asthenoshpere.
- Hot mantle materials will move to the surface thereby setting up a convection current.
- Heat from within the earth rises to the surface due to plate movement.
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