### Answer

The primary reservoir for Ca²⁺ (calcium ions) in the body is the bones. Bones store approximately 99% of the body's calcium, which serves not only as a structural component but also as a reservoir for calcium ions that can be released into the bloodstream as needed.

Here's a breakdown of the options:

1. **Muscles**: While muscles do use calcium ions for contraction, they do not serve as a reservoir.
2. **Bones**: This is the correct answer, as they store the majority of calcium in the body.
3. **Liver**: The liver has various roles in metabolism but does not act as a reservoir for calcium.
4. **Brain**: The brain uses calcium for neurotransmitter release, but it is not a storage site for calcium.
5. **Blood**: Blood contains calcium in a dissolved state, but it is not a major storage site compared to bones.

### Final Answer
**Bones** are the primary reservoir for Ca²⁺ in the body.

Question

### Answer

The primary reservoir for Ca²⁺ (calcium ions) in the body is the bones. Bones store approximately 99% of the body's calcium, which serves not only as a structural component but also as a reservoir for calcium ions that can be released into the bloodstream as needed.

Here's a breakdown of the options:

1. **Muscles**: While muscles do use calcium ions for contraction, they do not serve as a reservoir.
2. **Bones**: This is the correct answer, as they store the majority of calcium in the body.
3. **Liver**: The liver has various roles in metabolism but does not act as a reservoir for calcium.
4. **Brain**: The brain uses calcium for neurotransmitter release, but it is not a storage site for calcium.
5. **Blood**: Blood contains calcium in a dissolved state, but it is not a major storage site compared to bones.

### Final Answer
**Bones** are the primary reservoir for Ca²⁺ in the body.

Knowee AI · Accepted Answer

### Answer

The primary reservoir for Ca²⁺ (calcium ions) in the body is the bones. Bones store approximately 99% of the body's calcium, which serves not only as a structural component but also as a reservoir for calcium ions that can be released into the bloodstream as needed.

Here's a breakdown of the options:

1. **Muscles**: While muscles do use calcium ions for contraction, they do not serve as a reservoir.
2. **Bones**: This is the correct answer, as they store the majority of calcium in the body.
3. **Liver**: The liver has various roles in metabolism but does not act as a reservoir for calcium.
4. **Brain**: The brain uses calcium for neurotransmitter release, but it is not a storage site for calcium.
5. **Blood**: Blood contains calcium in a dissolved state, but it is not a major storage site compared to bones.

### Final Answer
**Bones** are the primary reservoir for Ca²⁺ in the body.

What is the reservoir for Ca2+ in the body?Multiple Choicemusclesbonesliverbrainblood

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What is the reservoir for Ca2+ in the body?

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