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14 Cards in this Set

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  • Back
A _____ is defined as a period of unconsciousness that lasts over an hour, during which the patient's eyes are closed.
One reason why humans and other animals have been successful is because of their _____ body plan.
The Swedish botanist Carolus Linnaeus invented the classification system that is used by modern biologists, which relies on _____ traits to distinguish among species.
These proteins which act like cellular "glue" to hold cells together is called _____.
This protein was first used by the group of animals known scientifically as ____.
Although sponges have no muscle, no neurons, and no brain, they do have specialized cells for eating and moving water. This specialization occurred first in this group and is known as _____.
cell differentiation
Muscle tissue is all the same in all animals, from the jelly fish to humans. The two types of proteins which enable muscles to contract are _____ and ____.
actin, myosin
To coordinate the motion of muscles, the cnidarians have a simple network of _____ that allows the muscle fibers to communicate using a combination of electrical impulses and chemical signals.
nerve cells
Most marine flatworms produce both eggs and sperm, a condition konwn as _____.
What is the most frequent cause of a coma and what happens to induce the coma?
The most frequent cause of a come is a head injury from an automobile accident. The brain comes to an abrupt stop in less than a second. deceleration injuey .This sudden stop causes the brain to ricochet against the skull wall. The violent motion causes damage to the neurons which then release brain chemicals. These chemicals cause the brain to swell producing a dramatic increase in pressure. This squeezes off the blood supply to different parts of the brain.
What happens if the brain is not supplied with blood?
The delivery of oxygen to the brain is dependent on an adequate blood supply. When this supply is stoped the cells begin to die. Cells within the cerebral cortex are affected first. Damage to the cerebral cortex leads to loss of memory and cognitive behavior. If the blood supply cut off is severe enough the brain stem is affected causing loss of basic functions.
How does a bilateral body plan help humans?
The human body can be divided into 2 halves producing mirror images of each other. All sensory organs are paired and arranged symmetrically. This arrangement allows for the development of stereoscopic sensing which helps in determining the direction of stimuli. By having paried appendages we can move with greater swiftness and stability.
Explain what is involved in a muscle contraction.
Muscle fibers contain individual contractile units known as sarcomeres. Each sarcomere contains thick (myosin) and thin (actin) filaments. The thick myosin filaments have protusions like oars that connect with the thing filaments. When stimulated, the oars utilize the energy from ATP and pull the thin filaments toward it, similar to rowing a boat. A large muscle contracts only when millions of sarcomeres work together.
Describe the radial body plan. Describe the bilateral plan and what are its advantages? For each body plan, give the first organism that first evolved this body plan. Once the bilateral body plan evolved, what advantage did it have for feeding?
Radially body plan has a regular, repeating pattern around a central axis (like a wagon wheel), or completely symmetrical (like a dinner plate) with no left or right orientation but possessing top and bottom orientation. The bilateral body plan can be divided into two halves, each being a mirror image of the other. All sensory organs are paird and are arranged symmetrically with this arrangement animals are able to develop stereoscopic sensing that allows the directions of stimuli to be determined. Having parid appendages means that animals can move with a greater swiftness and stability. The paried sensory organs are located adjacent to the brain, the control center. This placement allows for the information that is obtained from the sensory organs to be rapidly communicated to the brain. The Cnidarians were the first animal to have a radial body plan, whereas the flat worm were the first to have a bilateral body plan. The bilateral body plan allowed for the first hunters to evolve, which could seek out prey.