Monosaccharides, amino acids, mineral salts and water are absorbed by the intestinal epithelium and collected by the capillary vessels of the intestinal villi. A The last stage of food processing is absorption. It's so weird to realize how complex cells are, that they actually digest food like an organism would. In some molluscs, mechanical fragmentation is carried out by the radula a tooth-like structure. Collectively these ridges are called friction ridges. Fibrous connective tissue lacks these special contractile units.
Also common to all connective tissues is the presence of cells and an extracellular matrix that consists of fibers bathed in ground substance. The release of acetylcholine at the presynaptic membrane into the synaptic cleft is caused by the action potential which opens calcium channels. In animals with incomplete digestive tracts, digestion is mixed. They allow themselves to be taken into the cell and then they attack it from within, so it isn't always the best of systems! Therefore, it is an acidic pH. Which of the following statements regarding protein digestion is true? Benign growths exhibit symmetry, regular borders, uniform coloration, and they are usually less than 6 mm in diameter. Blood from the inferior vena cava then gains the right chambers of the heart and is pumped to the lungs for oxygenation.
When connective tissue is stretched, collagen gives it the ability to snap back Definition Collagen fibers provides high tensile strength. Inflamed pleural serous membranes reduce friction, resulting in the lungs not being pulled to fully expand during breathing. Term Which of the following cell organelles produces secretory vesicles? Term A needle would pierce the epidermal layers of the forearm in which order? Definition Lamellated granules of the cells of the stratum granulosum, a glycolipid that is secreted into extracellular spaces. This interaction is present in horses, cows, rabbits and in some insects, such as termites. True False Definition true Term Which of the following is a skin sensory receptor for touch? Which if the following statements is true about Olestra? Term Which is the most atypical connective tissue since it does not connect things or provide structural support? Smooth muscle does not have thick and thin filaments.
In skeletal muscle, calcium initiates contraction by binding to myosin light-chain kinase, while in smooth muscle calcium initiates contraction by binding directly to tropomyosin. They phagocytize a broad variety of foreign materials, ranging from foreign molecules to entire bacteria to dust particles. Which of the following accomplish this task: a. Carbohydrate digestion begins in the stomach. Mucin Salt A hormone An enzyme An amino acid Definition mucin Like mucous cells, goblet cells are unicellular exocrine glands that secrete mucin, a protein that combines with water to form mucus.
It also has the function of preventing intestinal contents from going back into the stomach. Granulation tissue is highly susceptible to infection. Term Which of the following is found on the surface of the skin? A ligand typically contacts a transmembrane receptor from the outside or from the cytoplasm; therefore, the ligand typically binds to the hydrophilic portion of the receptor. They will pass through the cell walls of individual cells to provide them with energy and other needed supplies for their survival. How can this phenomenon be explained? During extracellular digestion, macromolecules are broken down in places outside the cell in the extracellular space, in the surrounding area, in the lumen of digestive tracts, etc. Pancreatic secretory products act to emulsify large fat droplets D.
A It releases a hormone called gastrin, which stops gastric juice secretion. It begins in the extracellular space and finishes in the intracellular space. They all have collagen and elastic fibers in their extracellular matrix. In animals with complete digestive systems, extracellular digestion within the digestive tract predominates. What are these enzymes and which type of molecule do each of these enzymes break down? Reticular fibers form thick, ropelike structures. There are two kinds of intracellular digestion.
From the capillaries, nutrients go to the mesenteric circulation, a system of blood vessels that drains the intestinal loops. It has the function of keeping food within the gastric cavity for enough time to allow gastric digestion to take place. Which of the following statements concerning secretin is correct? Why is this phenomenon an adaptation to flight? The optimum pH for pepsinogen activation is between 7 and 9 d. Emulsification of large lipids into small droplets by bile salts. Skin does not have a role in regulating body temperature.
Definition stimulate blood vessels to develop within cartilage Cartilage is normally avascular, so nutrients required for healing must diffuse from distant blood vessels, which delays the healing process. This series of reactions is called: a. Cyanosis is a bronzing of the skin that occurs when the adrenal gland produces an inadequate amount of steroids. Definition They would have brittle, more easily broken hair. From the liver, nutrients are gathered by the hepatic veins, which discharge their blood content into the inferior vena cava.
Why is it necessary to maintain that pH level? The increased availability of nutrients allows microorganisms to replicate. Therefore, the lymphatic system plays an important role in the absorption of lipids. The base will neutralize the acid on the skin that retards the growth of bacteria, and the removal of the normal microbiota of skin will leave the person exposed to opportunistic pathogens. Changes in cytosolic calcium do not regulate cross-bridge activity in smooth muscle. It is secreted by the small intestine mucosa, and its main function is initiating the intrinsic electrical activity of the pacemaker cells in the stomach. This feature allows bile salts to enclose fats inside water-soluble micelles in a process called emulsification. The skin and mucous membranes are body's first line of defense and are mostly impenetrable to microorganisms, unless broken or damaged by tissue injury.