Answer:
The correct answer is - option B. They are small because they lack a nucleus.
Explanation:
Red blood cells or erythrocytes are specialized cell that produce in bone marrow and have specific role such as carrying oxygen from lungs to deliver it to the various organs and carry out carbon dioxide.
In mammals these cells lack cell organelles such as nucleus and mitochondria, a major factor that determined its smaller size. The size of RBC are move through narrow vessels throughout a organism because of its specific size and shape that provide it space for hemoglobin and allow to be flexible and bend to move through narrow vessels.
Thus, the correct answer is : option B. They are small because they lack a nucleus.
Answer:
Storm surge
Explanation:
Storm surge
Storm surge and large waves produced by hurricanes pose the greatest threat to life and property along the coast. Storm Surge is an abnormal rise of water generated by a storm's winds.
Hurricane Preparedness - Hazards
The small intestine comprises of an external layer called epithelium, from which originates microvilli that are the extensions of the small intestine, which projects in the form of tubes and their prime activity is to give a large surface area of absorption to obtain the majority of nutrients.
The nutrients obtained by the microvilli are included into the circulatory system, the prime activity of the circulatory system is to carry different constituents like amino acids, glucose, proteins, and other complex components like oxygen and hormones. It also helps in the conduction of various metabolic wastes discharged from the tissues.
The circulatory system comprises many kinds of capillaries, the most essential of which are arterial capillaries, venous capillaries, and fenestrated capillaries. The fenestrated capillaries are characterized by the pores present in the endothelial cells, which permits small molecules and restricted concentrations of proteins to pass through.
The most essential nutrient carried during the whole process is glucose. It has been considered as the prime source of energy, which is further hydrolyzed to produce two molecules of ATP. The ATP is known as the energy currency of the cell as it provides energy for different cellular and metabolic procedures essential for life.
