Final Exam Questions Flashcards
List the levels of organization from smallest to largest.
Atoms> Molecules> Smooth muscle cell> Tissue level> organ level> organ system level> organismal level
Define homeostasis.
Describes the body’s ability to maintain relatively stable internal conditions despite external changes
Define negative feedback mechanism and give an example
The response to the stimulus is to SHUT OFF the original stimulus or reduce its intensity. When the body is cold, the body heats itself up. When it reaches correct temperature, heating process shuts off.
Define “medial”
Towards the midline
Define “lateral”
Away from the midline of the body
Define “proximal”
Towards the origin of the limb
Define “distal”
away from the origin of the limb
List four properties that make water vital.
a) High heat capacity. Absorbs and releases large amounts of heat before temperature drops. Keeps us warm.
b) Polarity/solvent properties. Excellent solvent.
c) Chemical reactivity. Important reactant in digesting food or break down molecules.
d) cushioning. Forms a cusion around brain and spine.
What is an acid? What is a base?
Substance that can release hydrogen ions (H+) in detectable amounts. Proton donors. Base:proton acceptors. Releases hydroxyl ion OH-
What is the normal pH of blood?
pH 7.4
What is a buffer?
Systems of 1 or 2 molecules that act to prevent dramatic changes in hydrogen ion (H+). They are first line of defense in resisting pH changes.
Know the difference between a carbohydrate, lipid, and protein.
Carb: sugar-based
Lipid: fat-based
Protein: amino-acid based.
What is the primary use of glucose in the human body?
Universal cellular fuel
What is DNA? What does it contain?
Genetic material found within cell nucleus. Provides instructions for building every protein in the body.
What is ATP and why is it important?
Provides a form of chemical energy that all body cells can use.
Describe the characteristics of a plasma (cell) membrane. What is its function?
Contains the cell contents and separates them from the surrounding environment.
What is the function of the cell nucleus?
The control center, headquarter of a cell. Contains the genes with DNA.
State the function of each of the following organelles: Mitochondria
Supply most of the ATP. “Powerhouse” of a cell
State the function of each of the following organelles: Ribosomes
The actual sites of protein synthesis in the cell.
State the function of each of the following organelles: Lyosomes
Membranouse “bags” containing powerful digestive enzymes
State the function of each of the following organelles: Endoplasmic Reticulum
ER. Accounts for about half of a cell’s membrane. . It serves as a minicirculatory system for the cell because it provides a network of channels for carrying substances.
What is the function of cilia
cellular extensions that move substances along the cell surface. Propells other things. Ex: the ciliated cells of the respiratory system lining move mucus up and away from the lungs.
What is the function of flagella?
Propels the cell itself. Sperm’s tail
What is meant by selective permeability
A barrier allows some substances to pass thru it while excluding others.
Define: Diffusion
process by which molecules move away from a concentrated area to a less concentrated area.
Define: Osmosis
Diffusion of water through a permeable membrane.
Define: Filtration
process by which water and solutes are forced thru a membrane
Define: Active Transport
uses protein carriers to be transported across the membrane
Define: Phagocytosis
scavenger cells that eat bacteria and other foreign debris
What’s the difference between meiosis and mitosis?
Mitosis: division of the nucleus occurs first. Makes an identical of the first cell.
Meiosis: for gametes (sex cells) only. Mixes between 2 sets of DNA from parents.
How are epithelial cells classified?
Lining, covering, and glandular tissue of the body. It protects, absorbs, filters, and secretes. They are classified by identifying the relative number of cell layers and then its’ shape of the cell.
How is the function of simple epithelial cells different from stratified epithelial cells?
Simple: absorbs, secretes, and filters. Thin, so its not used for protection.
Stratified: Consists of 2+ layers. Primarily to protect.
What is transitional epithelium?
Lines only a few organs: bladder, ureters, and part of the urethra. They are “strectchy.”
What is the difference between an endocrine and exocrine gland?
Endocrine: lose their connection to the surface duct, so they are ductless. Their secretions go directly into the blood.
Exocrine: retain their ducts. Their secretions empty thru to the epithelial surface.
What are the 5 connective tissues?
- Bone
- Cartilage
- Tendons and ligaments
- Adipose tissue
- Blood
Describe the unique characteristics of smooth muscle cells:
or VISCERAL muscle. Found in the walls of hollow organs like the stomach, uterus, and blood vessels.
Describe the unique characteristic of the skeletal muscle:
can be controlled voluntarily
Define the characteristics of the cardiac muscle
Found only in the heart
What is another name for the skin?
Cutaneous membrane
Where would you find a mucus membrane?
Lines all body cavities that open to the exterior such as organs of respiratory, digestive, urinary, and reproductive tracts.
Where would you find the following serous membrane: Peritoneum
Abdominal cavity
Where would you find the following serous membrane: Pleura
Lungs
Where would you find the following serous membrane: Pericardium
Heart
Name the layers of the skin from the outermost to the innermost (include the hypodermis).
1) Epidermis
2) Dermis (Papillary layer, and then reticular layer)
3) Hypodermis
What is keratin? What is its’ function?
Tough protein. Hardened to help prevent water loss from the body surface. Keeps skin elastic.
What is melanin? What is its’ function?
Melanin is a pigment that ranges from yellow to brown to black. Shields DNA from damaging effets of UV.
Give an example of compact bone.
Tough bone on the outside that gives bones their rough exterior. (humerus)
Give an example of a Long Bone:
Has a shaft with heads at both ends. All bones of limbs (except knee, ankle, wrist.. are long bones)
Give an example of a flat bone:
thin, flattened. Skull, ribs, sternum
Give an example of an irregular bone:
The vertabrae
Give an example of a spongy bone
Soft part inside the bone
Give an example of a short bone
wrist, and ankles
What is the significance of the epiphyseal plate?
They cause the lengthwise growth of long bones
Explain what is found in the yellow bone marrow and the red bone marrow.
Yellow—fat
Red—makes red blood cells
Define: “osteocyte”
mature bone cells
Define: Osteoblast
bone-forming cells
Define: Osteoclast
Giant bone-destroying cells in bones
Define: Ossification
the overall process of bone formation
What two elements are needed for bone growth and remodeling?
Calcium and Vitamin D
How many vertebrae are there?
24
- What is the purpose of intervertebral disk?
Cushion the vertebrae and absorb shocks
Another name for “joint”?
Articulation
What is the function of synovial fluid?
Lubricate joints
Compare and contrast smooth muscle, skeletal muscle, and cardiac muscle
Smooth—walls of organs and blood vessels; nonstriated
Skeletal—muscles that u can control; striated
Cardiac—heart; striated
What is a “sarcolemma”?
Plasma membrane that surrounds skeletal muscle cell
What is a motor unit?
A motor neron (nerve cell) may stimulate a few muscle cells. One neuron and all skeletal muscle cells it stimulates is called a motor unit.
What is the neurotransmitter at the neuromuscular junction?
acetylcholine, or ACh
What is an origin? An insertion?
Origin: point that is attached to the bone
Insertion: attached to the movable bone. The insertion moves towards the origin. Some muscles have interchangeable origin/insertion
Describe Flexion
decreases the angle of the joint and brings 2 bones close together. Bending the knee/elbow or bending forward at the hip
Describe Extension
opposite of flexion. Increases the angle. Such as straightening the knee or elbow
Describe Abduction
moving a limb away from the midline or median plane. Stretching your arm out to the side. Also applies to fingers/toes when they are moved apart.
Describe Adduction
Opposite of Abduction. Bring arm closer to body.
Describe Rotation
movement of a bone around it’s longitudinal axis. Usually ball-n-socket joint. Shaking your head “no.”
Describe Circumduction
proximal end is stationary, and distal end moves in a circle. Stretch out arm and make a small circle at 45degrees
Describe Inversion and Eversion
Inversion: Turn foot medially.
Eversion: turn foot laterally.
Describe “Supination” and “Pronation”
Supination: when the forearm rotates laterally so that the palm faces anteriorly. Lift a cup of soup up to your mouth on your palm, you are “soup”-inating!
Pronation: Opposite of supination
Describe Dorsiflexion and Plantar Flexion
Dorsiflexion: Toe points towards knee
Plantar flexion: Toe points towards ground
What is a Prime Mover? And what is an Antagonist?
Prime mover—The muscle that has the major responsibility for cuasing a particular movement is the prime mover.
Antagonists—the muscle that oppose or reverses a movement
Example: the biceps of the arm (prime mover of elbow flexion) is antagonized by the triceps (a prime mover of elbow extension)
What does the CNS stand for? And what does it consist of?
Central Nervous System. Brain and spinal cord
What does the (PNS) consist of?
peripheral nervous system. Cranial and spinal nerves