ICBA Unit 4

What are the basic needs that all animals share?

Obtain nutrients & oxygen, fight infection, survive & reproduce.

Anatomical variation is a result of __________.

Evolution.

What is the primary function of epithelial tissues?

To cover the outside of the body and line organs and cavities inside the body.

What are the four types of tissue in animals?

Epithelial tissue, connective tissue, muscle tissue, and nervous tissue.

How do regulators manage their internal environment?

By using internal mechanisms to control conditions, regardless of external changes.

What is homeostasis?

Maintenance of a stable internal environment.

What is an example of negative feedback in the human body?

Insulin produced to control blood sugar, reducing it to maintain homeostasis.

What distinguishes a poikilotherm from a homeotherm?

A poikilotherm has varying body temperature based on the environment, while a homeotherm maintains a constant body temperature.

Define action potential.

A rapid, temporary change in a membrane potential.

What is the role of the Central Nervous System (CNS)?

To process and transmit information through the brain and spinal cord.

What is the function of the autonomic nervous system?

Carries signals to smooth and cardiac muscles.

What is Broca's area responsible for?

Regulating speech output.

Define fluid secretion in terms of hormone action.

Hormones travel through body fluids to act on specific target cells.

What is a fixed action pattern?

A sequence of unlearned acts directly linked to an external cue.

What are statocysts?

Organs containing mechanoreceptors that help in maintaining equilibrium in invertebrates.

What is the basic unit of muscle contraction?

The sarcomere.

Define migration in animal behavior.

A regular, long-distance change in location guided by environmental cues.

What role do pheromones play in animal behavior?

They are chemical substances emitted for communication, not just related to reproductive behavior.

What is the primary characteristic of connective tissue?

It holds many tissues and organs together and in place.

What factors can contribute to nervous system disorders?

Genetic and environmental factors.

What is the difference between afferent and efferent neurons?

Afferent neurons transmit information to the CNS, while efferent neurons transmit information away from the CNS.

What is the significance of cephalization?

It is the clustering of sensory organs at the front end of the body in bilaterally symmetrical animals.

How do muscle fibers contract?

Through interactions between actin (thin filaments) and myosin (thick filaments).

What is thermogenesis?

The process of adjusting metabolic heat production to maintain body temperature.

Define circadian rhythm.

Physiological changes that regulate the sleep-wake cycle.

What adaptation helps animals reduce heat loss?

Insulation from fur or fat layers.

What are the types of connective tissue?

Loose connective tissue, dense connective tissue, adipose tissue, cartilage, bone, and blood.

What are the types of muscle tissue?

Skeletal muscle, cardiac muscle, and smooth muscle.

What is the structure of skeletal muscle tissue?

Voluntary, striated muscles connected to bones, responsible for movement.

What distinguishes cardiac muscle tissue?

Involuntary, striated muscle found in the heart, with intercalated discs for communication.

What is unique about smooth muscle tissue?

Involuntary, non-striated muscle found in walls of hollow organs.

How are tissues categorized in the body?

Tissues are categorized into epithelial, connective, muscle, and nervous tissue.

What are five adaptations for regulation in animals?

Behavioral adaptation, physiological adaptation, structural adaptation, thermal adaptation, and metabolic adaptation.

What is behavioral adaptation in animals?

Changes in behavior to enhance survival, such as migration or hibernation.

What is physiological adaptation in animals?

Internal changes to processes to better cope with the environment, like increased heart rate in response to stress.

What is structural adaptation in animals?

Physical features that enhance survival, such as camouflage or specialized body parts.

What is thermal adaptation in animals?

Adjustments to body temperature regulation to cope with heat loss or gain.

What is metabolic adaptation in animals?

Changes in metabolic processes that help maintain energy balance under varying conditions.

What are the two main divisions of the nervous system?

The central nervous system (CNS) and the peripheral nervous system (PNS).

What is the main role of sensory neurons?

To transmit sensory information from receptors to the central nervous system.

What is the function of motor neurons?

To carry signals from the central nervous system to muscles or glands.

What are neurotransmitters?

Chemical substances that transmit signals across a synapse between neurons.

What is the resting potential of a neuron?

The electrical potential difference across the neuron's membrane when it is not actively transmitting a signal.

What occurs during depolarization in a neuron?

A rapid influx of sodium ions into the cell, causing the membrane potential to become more positive.

What is the role of the myelin sheath?

To insulate axons and improve the speed of electrical signals along the neuron.

What is the synaptic cleft?

The small gap between the axon terminal of one neuron and the dendrite of another through which neurotransmitters are released.

What is the function of glial cells?

To support, protect, and provide nourishment to neurons.

What are reflex arcs?

Neural pathways that mediate reflex actions, allowing for quick responses without direct involvement of the brain.

What are the main regions of the brain?

The main regions of the brain are the cerebrum, cerebellum, and brainstem.

What is the function of the cerebrum?

The cerebrum is responsible for higher brain functions, including thought, action, and emotion.

What role does the cerebellum play?

The cerebellum coordinates movement and balance.

What is the function of the brainstem?

The brainstem controls vital life functions, such as breathing, heart rate, and blood pressure.

What are the four lobes of the cerebrum?

The four lobes are the frontal lobe, parietal lobe, temporal lobe, and occipital lobe.

What is the primary function of the frontal lobe?

The frontal lobe is involved in decision-making, problem-solving, and controlling behavior.

What is the primary function of the parietal lobe?

The parietal lobe processes sensory information such as touch, temperature, and pain.

What is the primary role of the temporal lobe?

The temporal lobe is involved in processing auditory information and is important for memory.

What is the function of the occipital lobe?

The occipital lobe is the center for visual processing.

What is the significance of the hypothalamus?

The hypothalamus regulates homeostasis and controls the pituitary gland.

What is the role of the thalamus?

The thalamus acts as a relay station for sensory information before it reaches the cortex.

What is Wernicke's area responsible for?

Wernicke's area is involved in the comprehension of speech and language.

How are Broca's area and Wernicke's area related?

Broca's area is responsible for speech production, while Wernicke's area is responsible for language comprehension.

Where is Broca's area located in the brain?

Broca's area is located in the frontal lobe, specifically in the left hemisphere.

Where is Wernicke's area located in the brain?

Wernicke's area is located in the temporal lobe, specifically in the left hemisphere.

What is the result of damage to Broca's area?

Damage to Broca's area can lead to non-fluent aphasia, where speech becomes difficult to produce.

What is the result of damage to Wernicke's area?

Damage to Wernicke's area can lead to fluent aphasia, characterized by difficulty in understanding language and producing coherent speech.

What does aphasia refer to?

Aphasia is a communication disorder that affects an individual's ability to express and understand language, including speaking, writing, and comprehension.

What are the two primary classifications of aphasia?

The two primary classifications are expressive aphasia (challenges with speech production) and receptive aphasia (difficulties in comprehending language).

What is non-fluent aphasia?

Non-fluent aphasia, often associated with damage to Broca's area, is characterized by speech that is slow and requires effort, making sentence formation challenging.

What is fluent aphasia?

Fluent aphasia, commonly linked to damage in Wernicke's area, involves the production of lengthy, nonsensical speech while understanding language is severely impaired.

What is the leading cause of aphasia?

The leading cause of aphasia is typically a stroke that impacts the areas of the brain responsible for language.

What are the functions of statocysts in invertebrates?

Statocysts help in maintaining balance and orientation by detecting changes in position.

What is the structure of the ear responsible for sound detection?

The ear consists of three main parts: the outer ear, middle ear, and inner ear.

What are the sensory organs located in the inner ear?

The inner ear contains the cochlea for hearing and the vestibular system for balance.

What are the steps of muscle contraction?

Muscle contraction occurs through the sliding filament model involving the interaction of actin and myosin filaments.