Exam 3 Study Guide - Thermoreception to Muscle Contraction

These flashcards cover key concepts related to thermoreception, photoreception, plant behavior, and muscle contraction.

What do thermoreceptors detect?

Temperature changes.

What are nociceptors responsible for?

Transmitting the sense of pain from external and internal stimuli.

What are the two types of eyes discussed in the notes?

Compound eyes and single-lens eyes.

What is the function of rods in photoreceptors?

They detect low-intensity light but not color.

What does binocular vision provide?

Depth perception.

What do plants exhibit in response to stimuli?

Tropism.

What role do phytochromes play in plants?

They detect red and far-red light and mediate responses like photoperiodism.

What are the three major classes of photoreceptors in plants?

Phytochromes, phototropins, and cryptochromes.

What is thigmotropism?

Plant growth response to mechanical pressure or touch.

What does the hypersensitive response (HR) in plants involve?

A localized response to pathogen attack, including the production of hydrogen peroxide and nitric oxide.

What are the components of vertebrate skeletal systems?

Composed of cartilage, both cartilage and bone, and divided into axial and appendicular skeletons.

What two roles does ATP have in muscle contraction?

Provides energy for cross-bridge movement and breaks the link between actin and myosin.

What triggers the release of calcium in muscle fibers?

Action potentials that propagate along the muscle fibers.

What happens during the power stroke in muscle contraction?

Myosin heads pivot and pull actin toward the center of the sarcomere.