PRETEST - PRETEST What gas makes fruit ripen? Ethylene...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
PRETEST What gas makes fruit ripen? Ethylene Which hormone has seed dormancy? Abscisic Acid Which hormone has seed germination? Cytokinins What hormone prevents seed germination? Abscisic acid Gibberellins (florigens) support flower development. 2 plant hormones work together in antagonistic pairs Which hormones are secreted and flow through bloodstream? All?? What two glands connect? Hypothalamus and Anterior Pituitary What do the hormones released by the hypothalamus directly target? The Anterior Pituitary. Endocrine cells release hormones through the blood system Secreted by anterior pituitary?: growth GH & prolactin PRL (protein), follicle stimulating FSH & luteinizing LH & thyroid stimulating TSH (glycoprotein), adrenocorticotropic ACTH (peptide) What produces most hormones? Anterior Pituitary
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Neurosecretory cells are found in the pituitary gland Steroid hormones ? Adrenal Glands and Gonads Posterior/anterior Pituitary : Posterior- 2 hormone: Anterior- 6 (book), 7 (notes) Pituitary glands located where? Bottom/Below the brain More Na+ outside a cell is normal. If something binds to the receptors, but nothing happens, this will decrease the chances of an action potential occurring. The receptors are blocked. Post-synaptic neurons communicate with neurotransmitters by : binding to a receptor Action potentials are different from membrane how? Action potential: when does it decrease and increase? Closer (during)t o an A.P. when Na+ enters (depolarization) Further(after) from an A.P. when K+ exits (hyperpolarization) Propagation: A.P. flows down the axon, occurs faster when axon is myelinated ( in Schwann cells) Excitable : EPSP’s (Excitatory Post-synaptic potential), Na+ responsible for depolarization Inhibitory: IPSP’s( Inhibitory Post- synaptic potential), K+ responsible for hyperpolarization CNS : Brain and spinal cord Why do we know taste? Different parts of the brain are stimulated
Background image of page 2
How does the skeleton control movement? Muscle contractions? Action potential: All cells have a membrane potential, but only certain cells (muscle and neurons) have the ability to generate changed in their membrane potentials (excitable cells: have special ion channels called gated ion channel (which a stimulus will cause a change in)). Action potentials occur whenever a depolarization increases the membrane voltage to a particular value, called the threshold. Know thin and thick filaments (graphs):
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 10

PRETEST - PRETEST What gas makes fruit ripen? Ethylene...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online