Question

Oxygen from the air enters
the blood stream at what
location?

Cardiac notch
O Pulmonary vein
Alveoli
Paranasal sinuses​

Answer 1

Answer:

paranasal sinuses I think so

Answer 2

Explanation:

Respiratory System

The Respiratory System is vital to every human being. Without it, we would cease to live outside of the womb. Let us begin by taking a look at the structure of the respiratory system and how vital it is to life. During inhalation or exhalation air is pulled towards or away from the lungs, by several cavities, tubes, and openings.

The organs of the respiratory system make sure that oxygen enters our bodies and carbon dioxide leaves our bodies.

The respiratory tract is the path of air from the nose to the lungs. It is divided into two sections: Upper Respiratory Tract and the Lower Respiratory Tract. Included in the upper respiratory tract are the Nostrils, Nasal Cavities, Pharynx, Epiglottis, and the Larynx. The lower respiratory tract consists of the Trachea, Bronchi, Bronchioles, and the Lungs.

As air moves along the respiratory tract it is warmed, moistened and filtered.

This figure shows the upper half of the human body. The major organs in the respiratory system are labeled.

Figure 1. Click for a larger image. The major respiratory structures span the nasal cavity to the diaphragm.

Functions

There are four processes of respiration. They are:

Breather or ventilation

External Respiration, which is the exchange of gases (oxygen and carbon dioxide) between inhaled air and the blood.

Internal Respiration, which is the exchange of gases between the blood and tissue fluids.

Cellular Respiration

In addition to these main processes, the respiratory system serves for:

Regulation of Blood pH, which occurs in coordination with the kidneys,

Defense against microbes

Control of body temperature due to loss of evaporate during expiration