Question

Question 2 2 pts Consider how natural selection has worked on the parameters included in Fick's Law to maximize respiration efficiency in animals. In this regard, which of these statements about the characteristics of the mammalian lung is not true? lungs increase the temperature of the rand are most wowing greater solubility of gases at the respiratory surface, increasing the diffusion coefficient The constant delivery of poorly w ated blood toalveoll maintains a steep partial pressure gradient. P2-P1. favori diffusione into the body The alveolar sac is composed of simple amous epithelium, rather than columnar epithelium, which ensures that the diffusional path length is very small Alveoli present a large gas exchange surface area A Question 3 2 pts Which of these is not a disadvantage of an open circulatory system compared with a closed circulatory system? Because the pressure is lower in an open circulatory system, there is a slower flow of hemolymph. The molecules being exchanged between hemolymph and tissues do not have to diffuse across the wall of a circulatory vesselto reach a respiring cell Most open circulatory systems are only suitable for relatively sedentary organisms An open circulatory system cannot direct the hemolymph toward specific organs Question 4 2 pts Which of these is not an advantage of breathing air instead of water for eas exchange? Decomposers in water can deplete most of the oxygen in bags and other stagnant water habitats. Decomposers in air cannot deplete the oxygen to any significant extent O pen tends to be more abundant in than in water, making it easier to obtain Air is relatively dry compared to animal tissues Arises dense and viscous than water, so it takes less energy to ventilate with it

Answer 1

QUESTION 2:

*Our nasal airways is lined with cilia and are kept moist with mucous secretion, this combination of cilia and mucous helps in filtering the solid particles which in turn prevents damage to the delicate tissues of the respiratory system. During respiration, when the air passes through the nasal cavity it is warmed and humidified. Which helps in keeping the air from drying out the lungs. So, it's not the lungs which increases the air temperature.

*Diffusion is the primary process of gas exchange during respiration. As we know, diffusion takes place from region of high concentration gradient to region of low concentration gradient. Therefore, P2-P1 ( the difference of partial pressure of gas on either side of diffusion barrier) , favours diffusion of oxygen into the body.

* simple squamous epithelium consists of single thin layer of flattened cells and its function are diffusion, osmosis and filteration and are mainly present in the locations where absorption/diffusion of gases and transportation of small molecules is important (mainly possible because of its thin layer). Whereas, simple columnar epithelium is present in the small intestine and helps in absorbing the nutrients from the lumen of the intestine.

* For increasing the efficiency of the gas exchange, alveoli maximizes the surface area of the lungs, allowing more oxygen to diffuse at once.

Therefore, the correct answer is (I)