Funny stories? The longer the better-ha thats what she said. ANYWAYSSS I wanta laugh

In cardiac muscle, calcium ions do not bind to troponin molecules. calcium ions are not released from the sarcoplasmic reticulum

strojnjashka [21]

Answer:

Option). about 20 percent of the calcium ion required for contraction comes from outside the cell.

Explanation:

Calcium ions play an important role in cardiac muscle physiology. Calcium ions influx is responsible for plateau phase after depolarization. Calcium ions also play role in muscle contraction with the help of troponin (regulatory protein).

For contraction, about 20 percent of calcium ions are supplied from outside of the cell, while rest of the calcium ions are released from SR (sarcoplasmic reticulum).

Thus, the correct answer is 'forth option.'

3 0

3 years ago

how does the sensory information of stepping on a nail travel to the brain and what area of the brain it reaches?

Lemur [1.5K]

Because humans have five senses: feel, see, taste, hear, and smell. When you step on a nail you basically going to feel it and you brain can sense that and it can trigger nerves which can cause pain.

4 0

3 years ago

How does over population growth affect the community health ?

SpyIntel [72]

Answer:

Overpopulation could cause food shortages, easily spread diseases, undernourishment, etc.

Explanation:

It could cause food shortages, easily spread diseases, undernourishment, etc.

Hope this helps!

5 0

2 years ago

Which muscles move without conscious control?<br> voluntary or involuntary

ra1l [238]

I believe the correct answer is involuntary

<h2>Explanation</h2>

The human body has 2 groups of muscles; voluntary and involuntary that are divided into 3 types of muscles: Cardiac muscles found only in the heart, smooth muscles found in hollow organs and also internal organs and skeletal muscles that support the human skeleton and also protect organs. An example is the thigh muscle. Of the muscles, Cardiac muscles and smooth muscles are completely involuntary in addition to diaphragm which is a skeletal muscle.

<h2>Further Explanation</h2><h3>1. Cardiac Muscle</h3>

The cardiac muscle is found only in the heart and is controlled by the brain only. It is the reason why your heart beats without your control. The part of the brain responsible for this control is a region called pons in the hind brain. It is an involuntary muscle. It also is different in structure to all the other types of muscles.

<h3>2. Smooth muscles</h3>

These are muscles found in organs and also lining of some organs such as blood vessels and the bronchioles. They also form organs such as the liver, lungs and uterus. They are involuntary muscles that are under the control of the brain and perform functions such as breathing and regulation of body temperature and blood pressure.

<h3>3. Skeletal muscles</h3>

This is the most common type of muscle and is found in almost everywhere you touch for example the thighs, arms, legs, head, chest. They are tough muscles that coordinate to help the skeleton in movement, protect internal organs and also link up body parts. You can control them and they are voluntary. For example, when you stand up you use your skeletal muscles.

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