Answer:
The correct answer will be option-C
Explanation:
The rhythm of the heartbeat is controlled by the pacemaker of the heart called the sino-atrial node.
The SA node generates action potentials which trigger the contraction and relaxation of the atrium and ventricles. The membrane potential generation initiates by the depolarization of the cell membrane when the L type of Ca⁺² ions opens up and calcium ions enter the cell.
This depolarizes the cell until the potential threshold is reached which lies between the -40 and -30 mV.
Thus, Option-C is the correct answer.
Answer & Explanation:
As células sanguíneas são classificadas em três grupos básicos: os leucócitos ou glóbulos brancos, que são células de defesa integrantes do sistema imunitário; as hemácias , glóbulos vermelhos ou eritrócitos, responsáveis pelo transporte de oxigênio; e plaquetas, responsáveis pela coagulação sanguínea.
1. “Research the problem” matches with “use reliable sources, talk to experts and take notes”
2. “Organize data” matches with “create charts or graphs to display the results”
3. “Design an experiment” matches with “set up a procedure for testing your ideas; including variables and controls”
4. “Hypothesis” matches with “must be testable and falsifiable”
5. “Choose a problem” matches with “Come up with a question that can be answered”
The actual genetic makeup of an individual is its genotype.
please clearly state what you are asking ????
