Answer:
Explanation:
The chemical imbalance theory is unproven and often cited as an explanation for mental health conditions. It states that these conditions are caused by an imbalance of neurotransmitters between nerve cells in the brain. For example, depression is said to be a result of having too little serotonin in the brain.
<span>The resting heart rate will increase quickly in a person who has a high level of cardiovascular fitness.
False
</span>
Answer:
When you breathe in, or inhale, your diaphragm contracts and moves downward. This increases the space in your chest cavity, and your lungs expand into it. The muscles between your ribs also help enlarge the chest cavity. They contract to pull your rib cage both upward and outward when you inhale.
Explanation:
Is this a question or a statement?
Explanation:
A fertilized egg implants into the uterus
