Heart attacks happen suddenly when one of the arteries leading to the heart becomes blocked and cuts off the blood flow. Without oxygen, the heart muscles start to die.
Heart failure, on the other hand, usually develops gradually. The heart muscle becomes weaker and has trouble pumping blood to nourish the cells in your body. This is a chronic condition that gradually gets worse. But medications can help you live longer and better with it
Four bones of the skull contain paired air spaces called the paranasal sinuses that help to lighten the heavy load of the head.
<h3>What is Paranasal Sinus?</h3>
The paranasal sinuses are air-filled, bony spaces located next to the nasal passages in the face bones of the skull. They grow via slowly expanding pneumatized cells that erupt from the nasal cavity. The term is typically used in everyday speech to refer to the hollow, air-filled spaces in front of the human skull. There are four pairs of sinuses in humans. There are now eight sinuses in all. These four pairs of sinuses are together referred to as paranasal sinuses since they are all joined to the nasal cavity.
To know more about Sinus with the help of the given link:
brainly.com/question/8321398
#SPJ4
Answer:
There is no short answer.
Explanation:
Antigen presenting is a term used to describe the action of introducing them to the white blood cells and triggers the production of T cells which are essential to the immune system.
If we complete the sentences given in the question and put them in order;
1 - The antigen presenting cell encounters and processes the antigen.
2 - With the antigen, the antigen presenting cell migrates to the nearest lymph node.
3 - The antigen presenting cell displays the antigen to the T cells.
4 - The T cells initiate the immune response if the antigens are viral proteins or abnormal antigens.
5 - Infected or malignant cells are then destroyed before they can do further harm to the body.
I hope this answer helps.
Answer:
The source of life for fetus is the placenta which is connected by the umbilical cord.
Explanation:
The placenta is a temporary organ that during pregnacy connects the fetus and the mother trough the umbilical cord. It allows the fetus to recieve nutrients. It also helps to produce gas exchange, waste elimination and thermoregulation.
Placenta also participate as an endocrine organ (releasing HCG, Progesterone, Estrogen, human placental lactogen) and an immunity organ (allowing IgG antibodies to pass through).
Answer:
Explanation:
The parietal pleura represents a serous membrane b) lining the thoracic cavity.
The three main serous membranes in the body are the pleural, pericardial and peritoneal.
The pleura is a serous membrane that folds in two to create two layers in the pleural sac:
parietal pleura: outer layer that attaches to the chest wall and lines the thoracic cavity
visceral pleura: inner layer that covers each of the lungs individually
The peritoneal membrane lines the abdominal cavity.
The pericardial membrane covers the heart.
The visceral pleura covers the individual lungs
