The respiratory structure that contracts and relaxes to allow air to flow in and out of the lungs is option(c) i.e, the diaphragm.
<h3>What is
the diaphragm?</h3>
The diaphragm, a delicate skeletal muscle that separates the chest from the belly, is located at the base of the chest. When you breathe in, it flattens and shrinks. As a result, the lungs experience a vacuum effect that draws air in. The diaphragm relaxes and the air is forced out of the lungs when you exhale.
signs of diaphragm issues:
- Acid reflux, heartburn, coughing, and difficulty swallowing.
- alterations to skin tone (skin may turn blue).
- rapid heartbeat, pressure in the chest, and/or breathing difficulties (especially when lying down).
- Headaches.
- Hiccups that persist or recur frequently.
Patients who need surgery for conditions affecting the chest, including diaphragm issues, are treated by a thoracic surgeon.
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I believe it is A. Please forgive me if I am wrong.
Answer:
Cell differentiation.
Explanation:
This is because cell differentiation refer to the process where cell changes from one cell types to tissues or organs or even system or specialised cells during a developmental stages to perform functions. It occur in multicellular organisms where zygote changes to tissues or system.
. This occurs through a process called gene expression. Gene expression refer to the combination of genes that can either be expressed or repressed.
<span>One way social behavior increases survival in humans is the increased security from attackers
and other physical threats. Another is that social cooperation increases the likelihood for success in the gathering of required resources for survival such as food. It also increases the chances of survival of offsprings due to the cooperative raising
of the kids within the social grouping.</span>
In a newly fertilized egg, the vitelline layer lifts away from the egg and hardens to form a fertilization envelope.
Therefore, the correct answer is Option A.
<h3>What is vitelline layer?</h3>
- Vitelline layer or vitelline membrane (VM) is a structure that surrounds the outer surface of the plasma membrane of an egg or ovum. In some organisms (e.g.: birds), the vitelline layer surrounds the extracellular yolk and the ovum.
- It is multilayered and functions to protect and give shape to the egg yolk and separate it from the egg white.
- VM consists of protein fibers and protein receptors necessary for sperm binding.
- As its function is to provide support and protection to the yolk, after fertilization, the vitelline layer gets hardened and separated from the yolk to form fertilization envelope.
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