Answer:
plicae circulares and intestinal villi
Explanation:
The inner wall of the intestine is full of wrinkles, called villi. An enlargement of them under the microscope reveals that they are formed by cells whose surface has innumerable small "wrinkled" structures. The small intestine is the largest viscera of the body (about six meters). Intestinal villi and microvilli increase the area of contact with the intestine as well as the speed of absorption of food. Blood capillaries and lymph are in these villi to absorb nutrients.
The intestinal villi, have the function of increasing the absorption of nutrients after digestion. They are the folds of the intestines. The surface of the villi has an area of 12 cm² and the microvilli 240 cm².
Villi and microvilli increase the area of intestinal absorption by approximately 30 times and 600 times, respectively, providing exceptionally efficient absorption of nutrients in the lumen.
The entire small intestine has circular folds of mucosa, also called Kerckring valves and circular plicae. Most extend transversely around the small intestine cylinder for about half or two-thirds of its circumference, but some form complete circles, and some have a spiraling direction; The latter usually extend a little more than once around the bowel, but occasionally two or three times. Circular folds slow the passage of partially digested food along the intestines and provide an increased surface for absorption.
<span>The answer is: the winter months produced less food.
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The word "storage of food is most important" that start the passage telling that storing food in ideal condition is important.
The word "a valuable source of protein in the long winter season" signifies the need to keep the food in a long time. The reason why you need to store food for the winter season is that the land produces less food than demand, so you need to supply it from storage
Answer:
PLANT CELLS
Explanation:
plants use photosynthesis to get energy from the sun
Answer:
The urinary system consists of the ureters, kidneys, bladder, and urethra, also known as the renal system or urinary tract. It performs several functions including:
1. Regulate blood volume and pressure: change the amount of water lost in urine, EPO (more bone marrow activates RBC) and Renin
2. Regulate concentrations of plasma ions: monitors potassium, sodium, and chloride ions lost through urine and calcium ion levels by calcitriol synthesis (osteoclast activity and prevents urinary loss)
3. Helps to regulate blood pH: monitor hydrogen ion loss and bicarbonate ions in urine
4. Conserve essential nutrients: preventing nutrient excretion when excreting agricultural wastes
5. Help to detoxify toxins in the liver
