Anatomy
Explanation
Anatomy examines bodily structures and how they relate to one another. Physiology instead focuses on how those structures function during normal activity.
Physiology
Explanation
Physiology studies the normal functions and working of the body and its parts. Anatomy would address the heart’s structure rather than its pumping action.
Atoms, molecules, cells, tissues, organs, organ systems, organism
Explanation
Human organization progresses from atoms to molecules, then cells, tissues, organs, organ systems, and the organism. The other sequences place at least one level out of order.
Standing upright and facing forward with arms at the sides and toes pointing forward
Explanation
The anatomical position uses an upright person facing forward, with arms beside the body, feet together or slightly apart, and toes pointing forward. The other descriptions alter this standard reference posture.
Coronal plane
Explanation
The coronal, or frontal, plane separates the front from the back of the body. The sagittal plane separates right and left, while the transverse plane separates upper and lower regions.
Farther from the point of attachment
Explanation
Distal means farther from the point where a limb or structure attaches to the body. Proximal describes a position closer to that attachment point.
Integumentary, skeletal, muscular, nervous, endocrine, cardiovascular, lymphatic, respiratory, digestive, urinary, reproductive
Explanation
The human body systems include the eleven systems listed in the first option, including the lymphatic and reproductive systems. The other lists replace named systems with terms that are not part of this eleven-system classification.
Anabolism builds substances, whereas catabolism breaks substances down
Explanation
Metabolism includes anabolism, which builds substances, and catabolism, which breaks substances down. Detecting change and maintaining stability describe other body functions rather than these metabolic subdivisions.
Maintain a relatively stable internal environment
Explanation
Homeostasis is the process of preserving relative internal stability despite external changes. Detecting and responding to change is associated with responsiveness, not the definition of homeostasis itself.
To maintain homeostasis by monitoring and correcting internal changes
Explanation
A feedback system supports homeostasis by continuously monitoring the internal environment and correcting deviations from stable conditions. Energy production is a cellular metabolic function, not the defining purpose of feedback control.
Receptor detects the change, control centre processes it, effector acts, and a response occurs
Explanation
The receptor detects a change, the control centre evaluates the information, and the effector carries out the corrective action that produces a response. A common confusion is assigning detection to the effector, but the effector performs the response rather than sensing the change.
The basic structural and functional unit of life
Explanation
A cell is considered the basic structural and functional unit of life because living organisms are built from cells and cellular activities support life. An organelle is a component within a cell, so it cannot serve as the general definition of a cell.
Selective permeability that restricts substances according to their properties
Explanation
The plasma membrane is selectively permeable, meaning it permits some substances to cross while restricting others based on their properties. A nonselective barrier would not distinguish among substances in this way.
A gel-like region outside the nucleus containing cytosol, organelles, and dissolved substances
Explanation
The cytoplasm is the gel-like substance between the plasma membrane and nucleus and contains cytosol, organelles, and dissolved substances. The fluid inside the nucleus is the nucleoplasm, while the other descriptions refer to the plasma membrane and Golgi apparatus.
In the cytoplasm, where they synthesize proteins from RNA-directed instructions
Explanation
Free ribosomes are located in the cytoplasm and serve as sites of protein synthesis. Ribosomes may also attach to rough endoplasmic reticulum, but they are not located on the plasma membrane or within the Golgi apparatus.
Smooth endoplasmic reticulum lacks ribosomes and helps synthesize lipids, whereas rough endoplasmic reticulum has ribosomes and supports protein synthesis and transport
Explanation
Smooth endoplasmic reticulum lacks ribosomes and is associated with lipid synthesis, while rough endoplasmic reticulum bears ribosomes and helps synthesize and transport proteins. The key distinction is the presence of surface ribosomes on rough endoplasmic reticulum, not an identical function or reversed role.
The Golgi apparatus
Explanation
The Golgi apparatus modifies, sorts, and packages proteins and lipids, including forming secretory vesicles. The nucleus stores genetic material, while the smooth endoplasmic reticulum is associated mainly with lipid synthesis rather than final protein packaging.
Its hydrophilic region attracts water, whereas its hydrophobic region repels water.
Explanation
The hydrophilic part interacts favorably with water, while the hydrophobic part repels it. A common confusion reverses these properties, but the two regions have opposite relationships with water.
Passive transport following the concentration gradient
Explanation
Passive transport moves substances down their concentration gradient without cellular energy or ATP. Active transport instead moves substances against the gradient and requires an energy source.
Simple diffusion needs no carrier, facilitated diffusion uses membrane proteins, and osmosis moves water across a selectively permeable membrane.
Explanation
Simple diffusion occurs without carrier proteins, facilitated diffusion depends on specific channels or carriers, and osmosis is water movement through a selectively permeable membrane. The other choices assign energy requirements or transport roles to these processes incorrectly.
Active transport against the concentration gradient
Explanation
Active transport moves substances from lower to higher concentration, opposing the concentration gradient. Passive transport and simple diffusion move down a gradient, while osmosis specifically concerns water movement.
It seals neighboring cells and limits leakage between them.
Explanation
Tight junctions create seals between adjacent cells, helping prevent substances from leaking through the space between them. Gap junctions, by contrast, form communication channels that allow ions and small molecules to pass between cells.
They anchor adjacent cells through intermediate filaments.
Explanation
Desmosomes provide strong cell-to-cell adhesion by linking neighboring cells through intermediate filaments, which helps tissues withstand stretching. Attachment to the basement membrane is characteristic of hemidesmosomes rather than desmosomes.
They form channels that allow ions and small molecules to pass directly between adjacent cells.
Explanation
Gap junctions provide direct intercellular channels for ions and small molecules, supporting coordinated communication in cardiac muscle. Tight junctions prevent leakage, whereas anchoring junctions provide mechanical attachment rather than direct molecular passage.
Memorize the answers with 52 flashcards on Human Anatomy and Cell Biology.
What does Anatomy study in the human body?
The structure and relationships of its different parts.
What does Physiology study in the human body?
The normal functions and workings of its parts.
What is the first level in the human body's organization?
Atoms.
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