Decide whether each statement about urine formation is true or false. The liver changes toxic substances into less toxic substances that then travel to the
kidneys
The kidneys filter blood and produce urine.
Urine is made from the nutrients that are reabsorbed back into the blood from the
tubules
The kidney is the functional unit of the nephron
Urine is produced in the nephrons of the kidneys
Urine that is produced in the kidneys flows down the urethra to the bladder for storage
and then is excreted through the ureters.

Which statement correctly identifies the scientific question and describes why the question is scientific? question 1 refers to the supernatural. question 2 reflects a moral or social value. question 3 refers to something that can be measured. question 4 reflects a question that can’t be observed.

Select the correct answer from each drop-down menu proteins are

Choose the incorrect statement (a) the motor end plate membrane is only capable of generating graded potentials, but it is contiguous with the skeletal muscle sarcolemma, which can generate action potentials. (b) propagation of an action potential through the t-tubules into the sarcoplasmic reticulum triggers the release of ca++ into the cytoplasm of a skeletal muscle fiber. (c) the generation of suprathreshold endplate potentials in multiple muscle fibers could be due to the increased frequency of action potential generation at the axon hillock of a single motor neuron. (d) a greater amount of ach would be found in the presynaptic vesicles of a motor unit that fired several action potentials after exposure to botulinum toxin, than in a motor unit that fired several action potentials after exposure to the venom of the krait snake (which contains α-bungarotoxin).