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Actin changes shape.

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Mark Greenholt

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3y ago

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What are two acids that bind calcium?

Two acids that bind calcium are citric acid and oxalic acid. Citric acid, found in citrus fruits, forms soluble complexes with calcium, enhancing its absorption. Oxalic acid, present in foods like spinach and rhubarb, can bind calcium, reducing its bioavailability and potentially leading to the formation of calcium oxalate stones in the body.


Which protein do calcium ions need to bind to in order to initiate muscle contraction?

Calcium ions need to bind to the protein troponin in order to initiate muscle contraction.


Does cyclic amp bind to calmodulin?

No, calcium bonds to calmodulin


What does calcium bind to in smooth muscle contraction?

Calcium binds to the messenger protein Calmodulin. The calcium-calmodulin complex then activates myosin light chain kinase (MLCK), which phosphorylates myosin to allow it to bind to actin - producing contraction.


What Steps in muscle contraction require calcium ions?

Calcium ions bind to troponin, changing troponin's shape


What tubes bind calcium?

Lavender (NaEDTA) and Light Blue (sodium citrate)


What triggers the binding of myosin to actin?

Calcium ions bind to troponin and change its shape.


How is calcium used in muscle contraction?

Calcium ions are essential for muscle contraction as they bind to the protein complex troponin, causing tropomyosin to move out of the way and expose the myosin-binding sites on actin. This allows the myosin heads to bind to actin and form cross-bridges, leading to muscle contraction. After contraction, calcium is pumped back into the sarcoplasmic reticulum to relax the muscle.


What bridge forms between Calcium ions?

Calcium bridges form between muscle cells. The calcium ions bind to troponin-tropomyosin molecules in the grooves of actin filaments and form crossbridges.


What binds with edta to prevent the blood from clotting?

calcium bind with the EDTA to prevent the blood from clotting


What is the role of calcium ions in muscle contraction?

Calcium ions bind to the protein complex troponin, causing it to change shape and exposing active sites on actin filaments. This allows myosin heads to bind to actin, forming cross-bridges and leading to muscle contraction. When muscle stimulation ceases, calcium is pumped back into the sarcoplasmic reticulum, leading to muscle relaxation.


When CO2 mixes with water, ____ is formed. This acid increases ___ ions in the water, which the bind to ____ (used by some marine life to make shells) to form?

When CO2 mixes with water, carbonic acid is formed, the axis then increases positive ions, which then bind with calcium to form calcium carbonate.