about nutrient absorption by the intestinal mucosal cells is true? a. Carbohydrates are absorbed as disaccharides. b. Fats are absorbed as fatty acids and monoglycerides. c. Amino acids move across the plasma membrane only by diffusion. d. Bile transports fats across the plasma membrane. e. Most nutrients are absorbed in the duodenum. 4. Microbial fermentation in the gut of a cow a. produces fatty acids as a major nutrient for the cow. b. occurs in specialized regions of the small intestine
Premium Action potential Neuron
Cell Membrane Simple diffusion is when a small‚ non-polar molecule passes through a lipid bilayer. It is classified as a means of passive transport. In simple diffusion‚ a hydrophobic molecule can move into the hydrophobic region of the membrane without getting rejected. Simple diffusion does not involve a protein. An example of simple diffusion is osmosis. Hydrophilic molecules cannot participate in simple diffusion because they would move into the hydrophobic region of the membrane and be
Premium Membrane biology Cell Cell membrane
molecules can diffuse across cell membranes while some substances must be transported across the membrane by proteins. The membrane is in control of what enters and leaves the cell. However‚ certain conditions may damage the cell membrane’s structure. Beet cells‚ which are plant cells‚ have a water-soluble pigment called betacyanin‚ which is stored in its vacuole. The tonoplast‚ or the vacuole’s membrane‚ acts with the cell membrane of the cell to prevent the
Premium Cell membrane Cell Cell wall
resting membrane potential when extracellular K+ concentration is increased? -The resting membrane potential will become more positive when K+ concentration is increased. 2. Explain why the resting membrane potential had the same value in the cell body and in the axon. -The resting membrane potential has the same value in the cell body and the axon because the typical resting membrane potential is the same throughout the entire neuron. 3. Describe what would happen to the resting membrane potential
Premium Action potential
Mammalian cells are eukaryotic this means that all of their cells have common components‚ membrane bound organelles which prokaryotic cells do not this is shown in figure 1. Organelles are purpose made to carry out a specific function that is necessary within a cell. Due to the specificity of both conditions and concentrations with in these organelles these are compartmentalized. Encasing the organelle in a membrane allows is to do this. In most cases a single phospholipid bilayer is used however in certain
Premium Organelle Cell Mitochondrion
Name and describe the three main parts of a cell. plasma membrane-forms a cell’s flexible outer surface‚ separating the cell’s internal environment (inside the cell) from its external environment (outside the cell) cytoplasm- consists of all the cellular contents between the plasma membrane and the nucleus. nucleus- is the largest organelle of a cell. The nucleus acts as the control center for a cell because it contains the genes‚ which control cellular structure and most cellular activities
Premium Cell Protein Organelle
The body maintains homeostasis by the feedback inhibition‚ in which a stimulus produces a response that opposes the original stimulus. 3. The axon terminal is the nerve ending. The nodes speed up the message. The myelin sheath is an insulating membrane. The axon carries impulses away from the cell body. The cell body is the largest part of a typical neuron. The dendrites carry impulses from the environment or from other neurons toward the cell body. The nucleus is the control center of the cell
Premium Neuron Nervous system Axon
the nerve impulse would travel at a much slower speed. d) What is d? Explain what happens when an action potential reaches d. The structures labeled d are synaptic knobs. When an action potential reaches the knobs‚ they release neurotransmitters that carry the signal across the synapse. These neurotransmitters usually work by binding to receptor proteins in the membrane of the receiving neuron. This binding opens gates that allow sodium ions to enter the cell. 3. Name two ways
Premium Neuron Action potential Nervous system
surrounded by double membranes? Golgi apparatus lysosome mitochondrion nucleus cytoplasm A ✓ ✓ ✓ ✓ ✓ B ✓ ✗ ✗ ✗ ✗ C ✗ ✗ ✓ ✓ ✗ D ✗ ✓ ✗ ✗ ✓ 3 In which animal cells would Golgi apparatus be most abundant? A ciliated epithelial cells B goblet cells C red blood cells D smooth muscle cells 5 Which is a feature of all prokaryotic cells? A absence of cell surface membrane B division by mitosis C presence of mitochondria D presence of ribosomes 6 The diagram shows a cell surface membrane. The lipid
Premium DNA Cell membrane Cell
Positive feedback - The response enhances the original stimulus so that the response is accelerated Chapter 2 Chemistry comes Alive Matter: anything that takes up space and mass Energy: capacity to do work or put matter into motion Potential (stored energy) Kinetic ( active and working energy) Elements: substances that cannot be decomposed into smaller substances Atoms: made of protons‚ neutrons and electrons
Premium Neuron Action potential Muscle